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.

Question: In what city is the university that Thieme got his doctorate from? Passage 1:He received his doctorate in Indology in 1928 from the University of Göttingen, and habilitated there in 1932. From 1932 to 1935 he taught German and French at the University of Allahabad. He taught at Breslau from 1936 to 1940, and received tenure at Halle in 1941, but in the same year he was drafted to the German army, where he worked as an interpreter. In 1945, he was captured by U.S. troops in Württemberg. After his release in 1946, he returned to Halle, where he remained until 1953, when he moved to Frankfurt for a professorship in Indo-European studies, against the will of the GDR authorities. From 1954 to 1960 he was in Yale, and from 1960 to his retirement in 1972 in Tübingen as professor for Religious studies and Indology.
 Passage 2:Present for the nuptials in Patmos were several members of Olga's paternal family, including Queen Sofia of Spain (née Princess of Greece and Denmark), former King Constantine II of the Hellenes and his consort Queen Anne Marie (née Princess of Denmark), Prince Michael of Greece and Denmark and his wife, Marina (bride's parents), and Princess Irene of Greece and Denmark. With the exception of 78-year-old Margherita, Dowager Archduchess of Austria-Este (née Princess of Savoy-Aosta), all members of the Aosta branch of the House of Savoy were in attendance, i.e. Prince Amedeo of Savoy, 5th Duke of Aosta (bridegroom's father) and his consort Silvia, Duchess of Aosta, Princess Claude of Orléans ( Princess of France, bridegroom's mother), as well as Aimone's two full sisters, Princess Bianca Countess Arrivabene-Valenti-Gonzaga and Princess Mafalda Madame Lombardo di San Chirico, as well as Maria-Cristina (née Princess of Savoy-Aosta) and her husband Prince Casimir of Bourbon-Two Sicilies. From the senior branch of the Italian royal family Princess Maria Gabriella of Savoy (daughter of the late King Umberto II of Italy) was present, as she had been at the Athens wedding of Olga's parents in 1965.
 Passage 3:The fact that Byzantium in its dealings with the barbarians generally preferred diplomacy to war is not surprising. For the East Romans, faced with the ever-present necessity of having to battle on two fronts — in the east against Persians, Arabs and Turks, in the north against the Slavs and the steppe nomads — knew from personal experience how expensive war is both in money and manpower. The Byzantines were skilled at using diplomacy as a weapon of war. If the Bulgars threatened, subsidies could be given to the Kiev Rus. A Rus threat could be countered by subsidies to the Patzinaks. If the Patzinaks proved troublesome, the Cumans or Uzès could be contacted. There was always someone to the enemy’s rear in a position to appreciate the emperor's largesse. Another innovative principle of Byzantine diplomacy was effective interference in the internal affairs of other states. In 1282, Michael VIII sponsored a revolt in Sicily against Charles of Anjou called the Sicilian Vespers. Emperor Heraclius once intercepted a message from Persian rival Khosrau II which ordered the execution of a general. Heraclius added 400 names to the message and diverted the messenger, provoking a rebellion by those on the list. The emperor maintained a stable of pretenders to almost every foreign throne. These could be given funds and released to wreak havoc if their homeland threatened attack.
1