Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: Smog is made up of carbon particles.
[EX A]: What is smog made up of?

[EX Q]: the uterus used to make babies
[EX A]: What used to make babies?

[EX Q]: Cartilaginous fish possess thin skin.
[EX A]:
What type of skin does a fish have?