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

[EX Q]: Pests spread disease and destroy crops.
[EX A]: Who destroys crops?

[EX Q]: eagle eggs' shells and antacids are made of the same material
[EX A]: What are the shells of eagle eggs made of?

[EX Q]: Octopuses expel a dark cloud to hide from dolphins.
[EX A]:
What expels a dark cloud to hide from dolphins?