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

Q: The bells were ringing for Chuck Berry when this song made it to No1. His first and only British No. 1. What song?

A: chuck berry
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Q: Which instrument was Benny Goodman famous for playing?

A: benny goodman
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Q: Boris Godunov ruled, first as de facto regent and then as ruler, in which country?

A:
boris godunov
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