[Q]: Determine the topic of the question. Question: "what is dmitri mendeleev 4?" Topic:
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[A]: Dmitri Mendeleev

[Q]: Determine the topic of the question. Question: "what countries are in cono sur?" Topic:
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[A]: Southern Cone

[Q]: Determine the topic of the question. Question: "who was the first one to invent medicine?" Topic:
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[A]: History of medicine

[Q]: Determine the topic of the question. Question: "what is a medallion guarantee?" Topic:
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[A]:
Medallion signature guarantee