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

[Q]: The opening in the front of the eye is called pupil.
[A]: What is the opening in the front of the eye called?


[Q]: Fractional crystallization is the separation of compounds on the basis of their solubilities in a given solvent.
[A]: What is the separation of compounds on the basis of their solubilities in a given solvent?


[Q]: When the water vapor from a hot shower contacts the cooler surface of a mirror, the result is that foggy mirror.
[A]:
What results when the water vapor from a hot shower contacts the cooler surface of a mirror?