instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who was re-elected Prime Minister of Canada in May 2011?
answer:
prime minister of canada


question:
Who won the 2011 Booker Prize for 'The Sense of an Ending'?
answer:
the sense of an ending


question:
Although not the capital, Douala is the largest city of which country?
answer:

douala