instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Aragon and Castile joined to form which country?
answer:
aragon


question:
Harry, Tom, Dougie and Danny are collectively known as who in the pop world?
answer:
dougie poynter


question:
Who wrote the novels About A Boy, How To Be Good and High Fidelity?
answer:

how to be good