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.

Input: Consider Input: Question: How many years did the Great Depression last? Passage:Originally from New Brunswick, Harrison graduated from Nova Scotia Agricultural College in 1922, and, in 1924, from the Ontario Agricultural College with a B.Sc. in agriculture. He earned an MSc in plant pathology from Macdonald Campus of McGill University a year later. A doctoral degree he started at the University of Toronto in 1929 was abandoned due to the Great Depression. He established a herbarium of mycological specimens where he was employed for many years at the Kentville Research Station (now the Atlantic Food and Horticulture Research Centre); most of his collections are now housed at the Canadian National Mycological Herbarium. His early research concerned the fungal infestation of plants, such as that of Colletotrichum lindemuthianum on beans (Phaseolus). Working with John Frederick DeWitt Hockey, they made many contributions to the control and prevention of diseases of horticultural crops. They were among the first to use the sticky slide spore trap to estimate the densities of fungal spores.

Output: b

Input: Consider Input: Question: How many cast members did Line of Duty when it premiered on BBC2? Passage:Mercurio's next original drama series, Line of Duty (first broadcast 26 June 2012), premiered as BBC2's then best-performing drama series in 10 years with 4.1 million viewers. A well-received second series (first broadcast 12 February 2014) resulted in the BBC commissioning two further series for production in 2015 and 2016. The first series was nominated for a Royal Television Society Award for Best Drama Series and earned Mercurio his third nominations as Best Drama Writer by the Royal Television Society and The Writers' Guild of Great Britain. In 2014, Line of Duty was named in the Top 50 BBC2 Shows of All-Time, and named best television drama of the year by The Observer, and in 2016 ranked among the best BBC shows of all time and among the best police series of all time. In 2015, the second series won the Royal Television Society Award for Best Drama Series. and was nominated for four BAFTA Awards. Series 3 of Line of Duty became the most watched drama series broadcast on BBC2 in the multichannel era. Series 4 transferred to BBC One, consisting of six episodes broadcast from 26 March 2017.

Output: a

Input: Consider Input: Question: What teams won silver and gold in the World League 2011? Passage:In 2011 he was a coach assistant of Poland men's national volleyball team, when a head coach was Andrea Anastasi. In 2011 he won with this national team three medals. On July 10, 2011 achieved bronze of World League 2011. On September 18, 2011 Poland led by Anastasi and Gardini won bronze of European Championship 2011. In the same year, in December his team achieved silver at World Cup 2011 and was qualified for the Olympic Games 2012. For the first time in the history Polish national team won three medals in one year. On July 8, 2012 his team won the final match of World League 2012 against United States (3-0). In 2012 Polish team led by them took the 5th place at the Olympic Games London 2012. In October 2013 Anastasi and Gardini were dismissed as coaches of the Polish national team. On December 22, 2014 he was appointed a new head coach of Polish club Indykpol AZS Olsztyn. In May 2015 he signed a new contract with club from Olsztyn.
Output: a