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

[EX Q]: pollution contains very small or liquid particles in the air.
[EX A]: What type of particles are in the air?

[EX Q]: A radio is used for contact.
[EX A]: What is a radio used for?

[EX Q]: Standing still is used for avoiding predators.
[EX A]:
What is used for avoiding predators?