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

Example Input: Momentum is directly related to both mass and velocity.
Example Output: Momentum is directly related to both mass and?

Example Input: Very low density is the concentration of gas molecules in the mesosphere.
Example Output: What is the concentration of gas molecules in the mesosphere?

Example Input: Glucocorticoids and mineralocorticoids are the two main types of corticosteroids in humans.
Example Output:
Glucocorticoids and mineralocorticoids are the two main types of what in humans?