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

[EX Q]: You call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars, elliptical galaxies.
[EX A]: What do you call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars?

[EX Q]: Solid form do alkali metals take at room temperature.
[EX A]: What form do alkali metals take at room temperature?

[EX Q]: Sexual reproduction usually occur during times of environmental stress.
[EX A]:
What type of reproduction usually occur during times of environmental stress?