Problem: Given the question: What is the question to: "He has sold more than 100 million records worldwide, including 42 million tracks and 49.1 million albums in the United States."? The topic is Eminem.
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The answer is:
"how many albums has eminem sold in his career?"

Problem: Given the question: What is the question to: "Humans have two lungs , a right lung and a left lung."? The topic is Human lung.
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The answer is:
"how many lungs does a human have?"

Problem: Given the question: What is the question to: "George Washington at Constitutional Convention of 1787, signing of U.S. Constitution."? The topic is Constitution.
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The answer is:
"when was the constitution written?"