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

[EX Q]: What nationality was Che Guevara?
[EX A]: che guevara

[EX Q]: Mar Chiquita (Cordoba) is the largest natural salt lake in which South American country?
[EX A]: mar chiquita lake

[EX Q]: Whose debut album Rockferry was the bestselling UK album of 2008?
[EX A]:
album