Problem: Given the question: What is the question to: "Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons ."? The topic is Carbon-14.
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The answer is:
"what is Carbon 14 dating is a type of ??"

Problem: Given the question: What is the question to: "War between Japan and the United States had been a possibility that each nation's military forces planned for since the 1920s, though real tension did not begin until the 1931 invasion of Manchuria by Japan."? The topic is Events leading to the attack on Pearl Harbor.
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The answer is:
"what war led to Pearl Harbor?"

Problem: Given the question: What is the question to: "Human immunodeficiency virus (HIV) is a lentivirus (slowly replicating retrovirus ) that causes acquired immunodeficiency syndrome (AIDS), a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive."? The topic is HIV.
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The answer is:
"What is caused by the human immunodeficiency virus??"