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

Ex Input:
Air quality is a measure of pollutants in the air.

Ex Output:
Air quality is a measure of what in the air?


Ex Input:
The high points in a transverse wave are called crests.

Ex Output:
What are the high points in a transverse wave called?


Ex Input:
Sertoli cells cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die.

Ex Output:

What cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die?