Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[EX Q]: In which wars did the battles of Towton and Barnet take place?
[EX A]: battle of barnet

[EX Q]: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?
[EX A]: charles dickens

[EX Q]: What is the capital of Canada?
[EX A]:
canada