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

[EX Q]: In which city will the 2014 Tour de France begin?
[EX A]: 2014 tour de france

[EX Q]: What was the title of Britney Spears' second album (and the single that was released from it)?
[EX A]: britney spears

[EX Q]: The Apo Reef lies off the coast of which country?
[EX A]:
apo reef