In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.

Ex Input:
Question: What is one key difference between the Indus Valley civilization and early Vedic civilizations? Passage:The book discusses four prehistoric migrations in India. The book mentions that the Harappans were a mixture of Zagros agriculturists and First Indians, a wave of migrants who came from Africa into Arabia and then reached India around 65,000 years ago. Citing recent DNA evidence, the book traces the subsequent large migrations of anatomically modern humans into Indiaof agriculturalists from Iran between 7000 and 3000 BCE and Indo-European languages speaking pastoralists from the Central Asian Steppe (Aryans) between 2000 and 1000 BCE, among others. Tony Joseph used pizza as a metaphor to explain the break-up of subcontinental society. The book also discusses about similarities and differences between Indus Valley civilization and early Vedic civilization. The book mentions that 'Aryan' culture was most likely the result of interaction, adoption and adaptation among those who brought Indo-European languages to India and those who were already well-settled inhabitants of the region, and that Sanskrit and Vedas developed in the Indian subcontinent. Various tribes like the Andamanese and the Semang (Malay Peninsula), the Mani (Thailand) and the Aeta people (the Philippines) were the earliest inhabitants of Southeast Asia. According to Joseph, Proto-Dravidian is related to the Elamitic language of Iran. Caste system in India is a recent social system, reflected in sharply reduced inter-marriage (endogamy) and genetic mixing after 100 AD. This book also takes into account the path-breaking DNA research and findings from geneticist David Reich's research.

Ex Output:
a

Ex Input:
Question: How long had Jeffrey Ullman been teaching at Stanford the year Mairson got his B.A.? Passage:Mairson received a B.A. in Mathematics from Yale University in 1978 and a Ph.D. in Computer Science from Stanford University in 1984 under the supervision of Jeffrey Ullman. His Ph.D. thesis, The Program Complexity of Searching a Table, won the Machtey Award at the 1983 IEEE Symposium on Foundations of Computer Science (FOCS). Mairson was a Postdoctoral researcher at INRIA Rocqencourt from 1984 to 1985, at Stanford University in 1985, and at the University of Oxford in 1986. He held a Visiting Professor position from 1999 to 2001 at Boston University. From 2005 to 2007, Mairson has served as the Chair of the Faculty Senate at Brandeis. He is currently an Associate Editor of the journal Logical Methods in Computer Science and Information and Computation, and sits on the editorial board of Higher-Order and Symbolic Computation.

Ex Output:
b

Ex Input:
Question: Which side won the game that concluded Epstein's career? Passage:When Epstein's field goal attempt for the 2001 Wolverines was blocked on September 8 with 9:11 remaining against Washington and run back for a touchdown, it gave the Huskies a lead that they would not relinquish on the way to a 2318 game. Epstein made a 51-yard field goal against Iowa on October 27 to give Michigan a 6-point lead with 3:57 remaining. The 3226 score held up. He posted a school record 57-yard field goal against Michigan State in the November 3, 2001 MichiganMichigan State football rivalry game known as Clockgate. However, later in the game, Epstein's short punt and two Michigan penalties, made way for Michigan State's controversial game-winning drive. He made the game-winning 31-yard field goal against the Wisconsin on November 17, 2001 with 10 seconds left. Epstein set up the field goal when his punt bounced off of Badger Brett Bell and was recovered by Brandon Williams with 14 seconds left. In the game 3 of his 8 punts were downed inside the 20 yard line, including a 48-yarder that was downed on the 1-yard-line to set up Michigan's first score. 3 of his 5 kickoffs were touchbacks and a fourth one into the end zone was just returned 15 yards. Epstein's performance earned him Big Ten Special Teams Player of the Week recognition and his 8 points (2 FGs and 2 PATs) gave him the team scoring lead with 69 points. He finished the season with 76 points (1320 FGs and 3737 PATs) and 71 punts for 2790 yards (39.3 average/17 inside 20). Epstein's single-season punt yardage total was a school record that was surpassed the following season by Adam Finley. His 76 points just edged out B. J. Askew's 72 points and Marquise Walker's 68 points. Epstein earned All-Big Ten Conference second team honors as a placekicker from the coaches and honorable mention honors by both the coaches and media as a punter. He concluded his career by making 2 field goals in the January 26, 2002 Senior Bowl.

Ex Output:
a