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

[Q]: Which of the American Idol judges has been there for all 10 seasons?
[A]: american idol


[Q]: On November 22, 1986, which boxer became the youngest WBC Heavyweight champion, at age 20 years, 4 months, when he scored a TKO over Trevor Berbick in the second round?
[A]: boxing


[Q]: Who wrote the novel 'Brideshead Revisited'?
[A]:
brideshead revisited