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

[EX Q]: In 2013 Yahoo purchased which pictures and video microblogging website business that was founded in 2007 in New York City by David Karp?
[EX A]: yahoo!

[EX Q]: In which war was the Battle of Bunker Hill?
[EX A]: battle of bunker hill

[EX Q]: Its capital is Valverde - which is the smallest of the Canary Islands?
[EX A]:
valverde