Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Renewable energy sources emit fewer or no greenhouse gases.

A: What type energy sources emit fewer or no greenhouse gases?
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Q: The cardiovascular system in the human body consists of the heart, a network of blood vessels, and blood.

A: Which system in the human body consists of the heart, a network of blood vessels, and blood?
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Q: Symptoms of viral diseases result from a(n) immune response to a virus.

A:
Symptoms of viral diseases result from what kind of response to a virus?
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