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

[EX Q]: Although it was headquartered at Oak Ridge, TN, and the University of Chicago, what was the name of the WWII project that created the atomic bomb?
[EX A]: nuclear weapon

[EX Q]: In which range of mountains are the two highest peaks Aconcagua and Ojos Del Salado?
[EX A]: aconcagua

[EX Q]: Who was the head of RAF fighter command during the Battle of Britain?
[EX A]:
britain