[Q]: Determine the topic of the question. Question: "what does 3g network mean?" Topic:
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[A]: 3G

[Q]: Determine the topic of the question. Question: "what is the function of the vas deferens??" Topic:
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[A]: Vas deferens

[Q]: Determine the topic of the question. Question: "what does a timing belt do?" Topic:
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[A]: Timing belt

[Q]: Determine the topic of the question. Question: "what latitude is tropic of cancer?" Topic:
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[A]:
Tropic of cancer