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

Input: Consider Input: You call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars, elliptical galaxies.

Output: What do you call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars?

Input: Consider Input: Pleiotropic effects causes symptoms associated with sickle-cell disease.

Output: What causes symptoms associated with sickle-cell disease?

Input: Consider Input: Adulthood is divided into three stages.
Output: Adulthood is divided into how many stages?