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

[EX Q]: Dragonflies have two pairs of wings for flight.
[EX A]: How many pairs of wings do dragonflies have?

[EX Q]: Pigeon eggs have hard shells made of calcium carbonate.
[EX A]: What is the hard shell of pigeon eggs made of?

[EX Q]: Cameras are machines that save images
[EX A]:
What are machines that save images?