Problem: Given the question: What is the question to: "It uses an external power supply to make the DRAM non-volatile."? The topic is Solid-state drive.
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The answer is:
"how does a solid state drive work?"

Problem: Given the question: What is the question to: "In the United Kingdom , the return address is usually placed on the reverse of the envelope, near the top."? The topic is Return address.
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The answer is:
"where does the return address go on mail?"

Problem: Given the question: What is the question to: "The large intestine (or bowel, colon) is the last part of the digestive system in vertebrate animals ."? The topic is Large intestine.
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The answer is:
"what is another name for the large intestine?"