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

[EX Q]: What is the main river of Brazil?
[EX A]: brazil

[EX Q]: Which cyclist won the first medal for Team GB at the 2012 Olympic Games?
[EX A]: gb

[EX Q]: Which is the highest peak in the Caucasus Mountains?
[EX A]:
caucasus mountains