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

Q: Which British composer wrote the music used as the theme for Desert Island Discs  He also wrote the Dambusters march and the Knightsbridge march.?

A: the dam busters
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Q: In which wars did the battles of Towton and Barnet take place?

A: battle of barnet
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Q: Charon is a moon which orbits which body?

A:
charon
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