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

Ex Input:
Phospholipids are vesicles made of.

Ex Output:
What are vesicles made of?


Ex Input:
A diet rich in calcium and vitamin d may reduce the risk of osteoporosis and related bone fractures.

Ex Output:
A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures?


Ex Input:
Nuclear energy is released when the nucleus of an atom is split.

Ex Output:

What kind of energy is released when the nucleus of an atom is split?