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

[Q]: Optics explains the behavior of visible light and electromagnetic waves.
[A]: What type of physics explains the behavior of visible light and electromagnetic waves?

[Q]: Control rods play an important role in the modulation of the nuclear chain reaction.
[A]: What play an important role in the modulation of the nuclear chain reaction?

[Q]: The average global temperature has been rising since the end of pleistocene era.
[A]:
The average global temperature has been rising since the end of what era?