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

Ex Input:
Momentum is directly related to both mass and velocity.

Ex Output:
Momentum is directly related to both mass and?


Ex Input:
The outer layer of the sun is made up of plasma.

Ex Output:
What is the outer layer of the sun made up of?


Ex Input:
Carbon-oxygen bond type of double bond has a sigma bond and a pi bond.

Ex Output:

Which type of double bond has a sigma bond and a pi bond?