Detailed Instructions: 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.
Problem:Question: Which part of the body can lymph nodes be found in? Passage 1:Dekanozov studied in the medical schools of Saratov University and Baku University. In 1918 he entered the Red Army, and in 1920 he joined the Bolshevik Party. From 1918 he worked as a secret agent in Transcaucasia, first in the People's Commissariat for Health of the short-lived Azerbaijan Democratic Republic, then in private oil companies. After the invasion of Azerbaijan by the Red Army, Dekanozov worked for the Cheka of Azerbaijan SSR, where he befriended Lavrenty Beria, who subsequently supported Dekanozov. In 1921–27 Dekanozov worked for the Cheka in Azerbaijan, Georgia, and Transcaucasia. In 1927 he became an instructor of the Central Committee of the Communist Party of Georgia. In 1928–1931 he worked as one of the leaders of the Georgian and Transcaucasian OGPU. In 1931 he became a secretary of the Central Committee of the Communist Party of Georgia. From 1936 he was the Narkom of the food industry of Georgia, and from 1937 he simultaneously worked as the Chairman of Gosplan of Georgia and a deputy Chairman of Georgian Sovnarkom. He was a deputy of the Supreme Soviet of the USSR in 1937–50.
 Passage 2:Born on 5 March 1925 in Ubon Ratchathani, Siam, and brought up on the island of Réunion, Jacques Vergès is Vietnamese-French was the son of Raymond Vergès, a French diplomat, and a Vietnamese teacher named Pham Thi Khang. In 1942, with his father's encouragement, he sailed to Liverpool to become part of the Free French Forces under Charles de Gaulle, and to participate in the anti-Nazi resistance. In 1945 he joined the French Communist Party. After the war he went to the University of Paris to study law (while his twin brother Paul Vergès went on to become the leader of the Reunionese Communist Party and a member of the European Parliament). In 1949 Jacques became president of the AEC (Association for Colonial Students), where he met and befriended Pol Pot. In 1950, at the request of his Communist mentors, he went to Prague to lead a youth organization for four years.
 Passage 3:Diagnosis of MCC begins with a clinical examination of the skin and lymph nodes. Following, definitive diagnosis of Merkel cell carcinoma (MCC) requires examination of biopsy tissue to identify its histopathologic features. An ideal biopsy specimen is either a punch biopsy or a full-thickness incisional biopsy of the skin including full-thickness dermis and subcutaneous fat. On light microscopy, MCC shows basaloid tumor nests with neuroendocrine features ("salt and pepper" chromatin, scarce cytoplasm, and brisk mitotic activity). In addition to standard examination under light microscopy, immunohistochemistry (IHC) is also generally required to differentiate MCC from other morphologically similar tumors such as small cell lung cancer, the small cell variant of melanoma, various cutaneous leukemic/lymphoid neoplasms, and Ewing's sarcoma. Similarly, most experts recommend longitudinal imaging of the chest, typically a CT scan, to rule out that the possibility that the skin lesion is a skin metastasis of an underlying small cell carcinoma of the lung. Once an MCC diagnosis is made, a sentinel lymph node biopsy is recommended as a part of the staging work-up needed to determine prognosis and subsequent treatment options.

Solution:
3