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

[EX Q]: experiments are often done for learning and development
[EX A]: What is often done for learning and development?

[EX Q]: arithmetic includes uses for subtraction
[EX A]: What does arithmetic include?

[EX Q]: Parasites can enter the host through the epidermis.
[EX A]:
Parasites can enter the host through what?