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

Example Input: Aerobic exercise helps improve the cardiovascular system, while anaerobic exercise causes muscles to get bigger and stronger.
Example Output: Aerobic exercise helps improve the cardiovascular system, while what exercise causes muscles to get bigger and stronger?

Example Input: At a convergent plate boundary, when one plate is oceanic, there are large volcanoes.
Example Output: At a convergent plate boundary, when one plate is oceanic, there are large what?

Example Input: A(n) an ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.
Example Output:
What forms when the metal sodium gives up an electron to the nonmetal chlorine?