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

Ex Input:
Krist Novoselic and Dave Grohl were two thirds of which band, formed in Aberdeen (Washington State) whose albums include Bleach and In Utero?

Ex Output:
dave grohl


Ex Input:
The Battle of Antietam was fought during which war?

Ex Output:
battle of antietam


Ex Input:
During which conflict was the battle of Crecy fought?

Ex Output:

battle of crecy