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

[Q]: Grace Anna Goodhue was the wife of which US President?
[A]: grace coolidge


[Q]: Which comedian starred in the ABC sitcom Chicken Soup?
[A]: chicken soup


[Q]: Who starred in the 1933 comedy satire film 'Duck Soup'?
[A]:
duck soup