[Q]: Determine the topic of the question. Question: "what are the players in Quidditch??" Topic:
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[A]: Quidditch

[Q]: Determine the topic of the question. Question: "who is the book the catcher in the rye by??" Topic:
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[A]: The Catcher in the Rye

[Q]: Determine the topic of the question. Question: "when president nixon resigns?" Topic:
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[A]: Richard Nixon

[Q]: Determine the topic of the question. Question: "what can silk be used for?" Topic:
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[A]:
Silk