In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Let me give you an example: Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? Passage 1: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. Passage 2: John Ford (1894–1973) was an American film director whose career spanned from 1913 to 1971. During this time he directed more than 140 films. Born in Maine, Ford entered the filmmaking industry shortly after graduating from high school with the help of his older brother, Francis Ford, who had established himself as a leading man and director for Universal Studios. After working as an actor, assistant director, stuntman, and prop man – often for his brother – Universal gave Ford the opportunity to direct in 1917. Initially working in short films, he quickly moved into features, largely with Harry Carey as his star. In 1920 Ford left Universal and began working for the Fox Film Corporation. During the next ten years he directed more than 30 films, including the westerns The Iron Horse (1924) and 3 Bad Men (1926), both starring George O'Brien, the war drama Four Sons and the Irish romantic drama Hangman's House (both 1928 and both starring Victor McLaglen). In the same year of these last two films, Ford directed his first all-talking film, the short Napoleon's Barber. The following year he directed his first all-talking feature, The Black Watch.
. Passage 3: Since the late 1970s, the central part of NYU is its Washington Square campus in the heart of Greenwich Village. Despite being public property, and expanding the Fifth Avenue axis into Washington Square Park, the Washington Square Arch is the unofficial symbol of NYU. Until 2008, NYU's commencement ceremony was held in Washington Square Park. However, due to space constraints, ceremonies are now held at the Yankee Stadium. Important facilities at Washington Square are the Elmer Holmes Bobst Library, designed by Philip Johnson and Richard Foster, who also designed several other structures, such as Tisch Hall, Meyer Hall, and the Hagop Kevorkian Center. When designing these buildings Johnson and Foster also set up a master plan for a complete redesign of the NYU Washington Square campus. However, it was never implemented. Other historic buildings include the Silver Center (formerly known as "Main building"); the Brown Building of Science; Judson Hall, which houses the King Juan Carlos I of Spain Center; Vanderbilt Hall, the historic townhouse row on Washington Square North; The Grey Art Gallery at 100 Washington Square East, housing the New York University art collection and featuring museum quality exhibitions; the Kaufman Management Center; and the Torch Club – the NYU dining and club facility for alumni, faculty, and administrators. Just a block south of Washington Square is NYU's Washington Square Village, housing graduate students and junior and senior faculty residences in the Silver Towers, designed by I. M. Pei, where an enlargement of Picasso's sculpture Bust of Sylvette (1934) is displayed.
.
The answer to this example can be: 1
Here is why: The question refers to the 704th unit and task about war which is decribed by Passage 1.

OK. solve this:
Question: What are the symptoms of Castleman's disease? Passage 1:As far back as 1854, the famous glass exhibition building known as The Crystal Palace had been relocated from Hyde Park, London and rebuilt in an area of South London next to Sydenham Hill. This area was renamed Crystal Palace including the park surrounding the site where various sports facilities were built. The earliest known Crystal Palace football team first played here in 1861 as an amateur outfit. They went on to become founder members of the Football Association and competed in the very first FA Cup competition reaching the semi-finals where they were eliminated by the Royal Engineers in a replay after the first game ended goalless. The team also played in the FA Cup in the next four seasons before disappearing from historical records after a 0–3 defeat to eventual winners Wanderers in the second round of the 1875–76 FA Cup. In 1895, the Football Association adopted a new permanent home for the FA Cup Final which was to be played at the sports stadium situated inside the historic grounds of the Palace. With the owners also reliant on tourist activity for their income, they sought fresh attractions for the venue, and founded the London County Cricket Club of W. G. Grace before turning their attention to football.
 Passage 2:The first known settlers in the area of modern Nashville were Native Americans who arrived in the region by at least 13,000 BC during the Paleoindian period of regional prehistory. For millennia the descendants of these first Tennesseans continued to live along the river terraces and uplands overlooking the Cumberland River, leaving behind a dense archaeological record spanning the Paleoindian, Archaic, Woodland, and Mississippian periods. The final prehistoric Native American culture to inhabit what would become Nashville was a regional manifestation of the Mississippian Culture known as Middle Cumberland Mississippian, identified by archaeologists based on the specific combination of burial practices, artistic style, and ceramic styles. Recent studies suggest that Middle Cumberland Mississippian culture may be the result of interactions between local populations and outsiders from the American Bottom who moved into the western portion of the Nashville Basin around AD 1000, settling at the site of Mound Bottom. The archaeological footprint of the Middle Cumberland Mississippian culture appears throughout Nashville as the many platform mounds, extensive stone box cemeteries, palisaded villages, and small prehistoric farmsteads that have been destroyed by antiquarian scholars, relic hunters, and urban development. All archaeological evidence for Mississippian culture appears to vanish from the Nashville area by around AD 1475–1500. Archaeologists believe this regional collapse may have been the result of extreme pressures brought on by rapid population growth and dwindling resource availability following prolonged droughts leading to increased occurrences of disease, nutritional deficiencies, and warfare.
 Passage 3:Herpesviruses are a third group of common cancer-causing viruses. Two types of herpesviruses have been associated with cancer: the Epstein–Barr virus (EBV) and human herpesvirus 8 (HHV-8). EBV appears to cause all nonkeratinizing nasopharyngeal carcinomas and some cases of lymphoma, including Burkitt's lymphoma—the association is especially strong in Africa—and Hodgkin's disease. EBV has also been found in a variety of other types of cancer cells, although its role in causing these other cancers is not well established. KSHV/HHV-8 causes all cases of Kaposi's sarcoma, and has been found in some cases of a cancer-related condition called Castleman's disease. Studies involving other kinds of cancer, particularly prostate cancer, have been inconsistent. Both of these herpesviruses are commonly found in cancerous cells of primary effusion lymphoma. Herpesviruses also cause cancer in animals, especially leukemias and lymphomas.

Answer:
3