instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who composed Air on the G String?
answer:
air on the g string


question:
Where on Prince Edward Island, Canada, is Anne of Green Gables located?
answer:
canada


question:
Of Beavis and Butt-head, which one wore the AC/DC t-shirt?
answer:

beavis and butt-head