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

[Q]: Who succeeded Henry Cooper as British Heavyweight Boxing Champion?
[A]: boxing


[Q]: Which two brothers had hits with Cathy's Clown and Wake Up Little Susie?
[A]: cathy's clown


[Q]: Who composed the opera `Carmen` Mozart, Purcell or Bizet?
[A]:
carmen