instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which English king was the son of Edward, the Black Prince?
answer:
edward, the black prince


question:
'Bring It All Back' was the debut single for which group in 1999?
answer:
bring it all back


question:
Ehud Olmert became Prime Minister of which country in 2006?
answer:

ehud olmert