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

[Q]: Fly larvae enter the host through epithelial tissue
[A]: What enters the host through epithelial tissue?


[Q]: Semen are made in the testicles
[A]: What are semen made in?


[Q]: Thrinaxodon is from the animal family that eventually changed into mammals.
[A]:
What did Thrinaxodon become?