Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?

Answer: charles dickens

Question: Whose tale in Chaucer's The Canterbury Tales tells of a knight sent away by his queen to discover what women want above all else?

Answer: the canterbury tales

Question: In which famous film did Michael Caine play a character named Charlie Croker?

Answer:
charlie croker