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

Input: Consider Input: Three many families are known quarks divided into.

Output: How many families are known quarks divided into?


Input: Consider Input: Stimulation of triglyceride breakdown is the first direct action of growth hormone.

Output: What is the first direct action of growth hormone?


Input: Consider Input: A concave lens is thicker at the edges than it is in the middle.


Output: What type of lens is thicker at the edges than it is in the middle?