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: Alexander the Great died in which ancient city?

Answer: alexander the great

Question: Which late 17th and early 18th century British architect designed Brighton Pavilion, Marble Arch, and the plan for London's Regents Park?

Answer: royal pavilion

Question: Bear Grylls is the only person to appear in what TV series?

Answer:
bear grylls