Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question: Which of the last three head coaches that Jackson served under  was the oldest? Passage 1:Desrosiers played with the Rimouski Océanic of the Quebec Major Junior Hockey League (QMJHL) from 2012 to 2015. Following his first full season with Rimouski Océanic he was awarded the Raymond Lagacé Trophy as the QMJHL Defensive Rookie of the Year and was also named to the 2012–13 QMJHL All-Rookie Team. On April 19, 2014, the Dallas Stars of the National Hockey League signed Desrosiers to three-year entry-level contract, but he was returned to the Rimouski Océanic for the 2014–15 QMJHL season where, in his final year of major junior hockey, he was recognized for his outstanding play when he posted the QMJHL Best GAA of 2.50 to win the Jacques Plante Memorial Trophy and was selected as the 2014–15 CHL Goaltender of the Year.
 Passage 2:Fred Jackson (born June 9, 1950) is an American football coach and former player. He was previously the running backs coach at the University of Michigan. In 2014, he was the longest tenured member of the Michigan Wolverines football coaching staff, having been with the program since 1992. Jackson served on the staffs of Gary Moeller, Lloyd Carr, Rich Rodriguez, and Brady Hoke. In addition to coaching running backs, Jackson served as Michigan's offensive coordinator (1995–1996), assistant head coach (1997–2002), and associate head coach (2003–2007). He was a finalist for the Broyles Award, given annually to the nation's top college football assistant coach, in 2000. After Michigan head coach Lloyd Carr retired following the 2007 season, Jackson was the only member of the coaching staff retained by Carr's successor, Rich Rodriguez. When Rodriguez was fired after the 2010 season, Jackson was the only member of Rodriguez's staff retained by his successor, Brady Hoke. Hoke and Jackson served as assistants together under Carr and Gary Moeller for a total of eight years including the 1997 national championship season.
 Passage 3:The Yablanski House was built in 1906-1907 to the designs of Austro-Hungarian architect Friedrich Grünanger (1856–1929) on the order of the wealthy financier and former mayor of Sofia Dimitar Yablanski (1859–1924). The exterior decoration was the work of the royal decorator of the Bulgarian Royal Family, Andreas Greis. Architecturally, the house was designed in the Baroque style with some Renaissance elements, with the interior stucco done in the Rococo style. The mansard floor is an important feature of the house's artistic design, together with the balcony railings of wrought iron and the several female sculptures. The furniture and the materials were specially supplied from Vienna. The house's architecture draws heavily from an earlier work of Grünanger's, the Royal Palace in Sofia. Notably, the architect's home in Salzburg, where he later moved and subsequently died, is almost identical to the Yablanski House.

Student:
2