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 died of a burst appendix after being punched in the stomach?
[EX A]: appendicitis

[EX Q]: What is the four-word name of the 1951 play on which 'Cabaret' is based?
[EX A]:
cabaret