Definition: 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.
Input: Question: What country was the university Sadeq Tabatabaei got his doctorate from located in? Passage 1:In 1961, Sadegh Tabatabai went to Aachen to study biochemistry and later received his doctorate from the University of Bochum. While in Aachen, he organized a student group that campaigned against Shah Mohammad Reza Pahlavi. In 1967, he handled Ulrike Meinhof material about Iran, which was used in a famous column in Konkret magazine opposing the Shah's visit to West Germany that year. Tabatabai gave a speech at the grave of Benno Ohnesorg, an unarmed university student who was shot during a demonstration against the Shah's visit to the Deutsche Oper in Berlin by Karl-Heinz Kurras, a police officer later discovered to be an agent of the East German secret police, the Stasi.
Passage 2:Born in Genoa, Pellegri is a youth product of the Genoa youth academy. On 22 December 2016, he made his debut with the senior team in Serie A in a 10 away loss against Torino, coming on as an 88th-minute substitute for Tomas Rincon. At the age of 15 years and 280 days, he equalled the record as the youngest ever Serie A debutant, held by Roma's Amedeo Amadei since 1937. In doing so he also became the first player born in the 21st century to appear in Serie A, and the second player born in the 2000s to make his Italian top-flight debut after Moise Kean. On 28 May, he scored his first Serie A goal in a 32 away loss against Roma, becoming the first player born in the 21st century to ever score in Serie A, and the third youngest goalscorer ever in the Italian top flight, after Amadei and Gianni Rivera.
Passage 3:Sothoron broke into the major leagues when the spitball was still legal. His best season came in 1919, when he posted a 2013 record with a 2.20 earned run average for the Browns, finishing fifth in the American League in wins and ERA. After the spitball was outlawed following the 1919 campaign, Sothoron at first was not permitted to throw it, then in mid-1920 he was added to a list of 17 spitballers in the majors who were allowed to continue using the banned pitch. But he was never able to match his 1919 numbers. His pitching career ended in St. Louis with the National League Cardinals, where he played for his first MLB manager, Branch Rickey, and led the NL in shutouts with four in , despite a mediocre 1016 (3.57) record. During his MLB career, he appeared in 264 games pitched, and allowed 1,583 hits and 596 bases on balls in 1,582 innings pitched. He struck out 576 and hurled 102 complete games.

Output:
1