Problem: Given the question: What is the question to: "A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch."? The topic is Chronograph.
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The answer is:
"what is a chronograph watch?"

Problem: Given the question: What is the question to: "The first color cinematography was by means of additive color systems such as the one patented in England by Edward Raymond Turner in 1899 and tested in 1902."? The topic is Color motion picture film.
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The answer is:
"how was color introduced in film??"

Problem: Given the question: What is the question to: "As of the last census of agriculture in 2007, there were 2.2 million farms, covering an area of , an average of per farm."? The topic is Agriculture in the United States.
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The answer is:
"how many grape farms in united states?"