Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Water contains 3 atoms.

Answer: How many atoms does water contain?


Question: A pregnant woman should avoid toxic substances while pregnant.

Answer: What should a pregnant woman avoid while pregnant?


Question: The light-producing process fluorescence occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light.

Answer:
What light-producing process occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light?