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 rank of the peerage is directly below a duke?

Answer: duke


Question: Which Dutchman managed both Newcastle and Chelsea in the 1990s?

Answer: chelsea f.c.


Question: In the musical and T S Eliot's book Cats, which was the railway cat?

Answer:
cats