Problem: Given the question: What is the question to: "DMX has sold over 30 million records worldwide, making him one of the best-selling hip-hop artists of all time."? The topic is DMX (rapper).
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The answer is:
"how many albums has dmx sold to this date?"

Problem: Given the question: What is the question to: "The mill or mille () (sometimes mil in the UK , when discussing property taxes in the United States , or previously in Cyprus and Malta ) is a now-abstract unit of currency used sometimes in accounting ."? The topic is Mill (currency).
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The answer is:
"what is 1 mil guaranies in united states dollars?"

Problem: Given the question: What is the question to: "Cluster sampling is a sampling technique used when "natural" but relatively homogeneous groupings are evident in a statistical population ."? The topic is Cluster sampling.
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The answer is:
"what is the difference between multistage and cluster sampling?"