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

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

[EX Q]: Which Irish boxer was nicknamed the Clones Cyclone?
[EX A]: boxing

[EX Q]: Oct 21, 1797 saw the launch of what famous frigate, the world's oldest commissioned warship, in Boston Harbor?
[EX A]:
boston