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

[EX Q]: Who plays Dr Evil the nemesis of Austin Powers in the Austin Powers series of films?
[EX A]: austin powers

[EX Q]: Which boxer was nicknames `The Brown Bomber`?
[EX A]: boxing

[EX Q]: Dr. Banner is the alter-ego of which comic book hero?
[EX A]:
hulk