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

Q: Limestone is insoluble in water, so acid can dissolve it.

A: Limestone is insoluble in water, so what can dissolve it?
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Q: Electric motors transform electrical energy into kinetic energy.

A: Electric motors transform electrical energy into what other form of energy?
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Q: One gram of proteins provides four calories of energy.

A:
One gram of proteins provides how many calories of energy?
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