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

[Q]: What was the last silent film in which Chaplin's little tramp appeared?
[A]: chaplin


[Q]: In which 1960's TV series did Clarence the cross-eyed lion appear?
[A]: clarence, the cross-eyed lion


[Q]: Who wrote the novel 'Ben Hur'?
[A]:
ben-hur: a tale of the christ