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

[EX Q]: Which American city has baseball-playing 'Dodgers'?
[EX A]: los angeles dodgers

[EX Q]: Which actress played Arwen in the trilogy of films?
[EX A]: arwen

[EX Q]: All My Sons (1947) and The Misfits (1961) are both plays written by whom?
[EX A]:
all my sons