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

Ex Input:
Cinder Cone, composite, and shield are all types of what?

Ex Output:
cinder cone


Ex Input:
What country has an official residence called Blair House, kept for guests of the leader of the country?

Ex Output:
blair


Ex Input:
The Bridal Chorus, more famous today as Here Come The Bride, comes from an Opera by which composer?

Ex Output:

bridal chorus