TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which former Portuguese African Colony joined the British Commonwealth in 1995?

SOLUTION: commonwealth of nations

PROBLEM: And Then There Were None?

SOLUTION: and then there were none

PROBLEM: Which jockey won the 2007 Derby at Epsom on 'Authorized', at his fifteenth attempt?

SOLUTION:
authorized