Problem: Given the question: Determine the topic of the question. Question: "how many albums has dmx sold to this date?" Topic:
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The answer is:
DMX (rapper)

Problem: Given the question: Determine the topic of the question. Question: "what is 1 mil guaranies in united states dollars?" Topic:
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The answer is:
Mill (currency)

Problem: Given the question: Determine the topic of the question. Question: "what is the difference between multistage and cluster sampling?" Topic:
++++++++++++++++++++++++++++++++
The answer is:
Cluster sampling