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

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

[EX Q]: Who wrote the novel 'Brideshead Revisited'?
[EX A]: brideshead revisited

[EX Q]: Who had a number one in 2000 with Black Coffee?
[EX A]:
black coffee