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

[Q]: Who played 'Emma Peel' in the 1998 film 'The Avengers'?
[A]: the avengers


[Q]: The Brooklyn Bridge crosses which river?
[A]: brooklyn bridge


[Q]: Who played oil baron Clayton Farlow in the 80's soap Dallas?
[A]:
clayton farlow