Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Which American city has baseball-playing 'Dodgers'?

Answer: los angeles dodgers

Question: 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?

Answer: nuclear weapon

Question: What King was beheaded during the English Civil War?

Answer:
decapitation