[Q]: Determine the topic of the question. Question: "how is hydrogen produced?" Topic:
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[A]: Hydrogen production

[Q]: Determine the topic of the question. Question: "where are facial sinuses?" Topic:
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[A]: Paranasal sinuses

[Q]: Determine the topic of the question. Question: "when was steven tyler born?" Topic:
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[A]: Steven Tyler

[Q]: Determine the topic of the question. Question: "what area code is 810?" Topic:
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[A]:
Area code 810