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

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

[EX Q]: Which British Prime Minister signed the 'Entente Cordiale' in 1904?
[EX A]: prime minister of the united kingdom

[EX Q]: Which US band had hits with Call Me, Atomic and Heart of Glass?
[EX A]:
atomic