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: Name Shakespeare play Ariel, Miranda and Prospero appear?

Answer: ariel


Question: In music, which band consists of Billy Gibbons, Dusty Hill and Frank Beard?

Answer: frank beard


Question: To which US state is the Green Mountains section of the Appalachians confined?

Answer:
united states