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

[EX Q]: Unicellular eukaryotes are protists normally.
[EX A]: What type of eukaryotes are protists normally?

[EX Q]: A electron microscope is used to see extremely small objects.
[EX A]: What type of microscope is used to see extremely small objects?

[EX Q]: Light retains its original color under water because frequency remains the same when light is refracted.
[EX A]:
Light retains its original color under water because what remains the same when light is refracted?