Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Toxins is contained in the skin of brightly colored poison dart frogs.
[EX A]: What is contained in the skin of brightly colored poison dart frogs?

[EX Q]: A pregnant woman should avoid toxic substances while pregnant.
[EX A]: What should a pregnant woman avoid while pregnant?

[EX Q]: Stress is applied to a rock to make it bend and flow.
[EX A]:
What is applied to a rock to make it bend and flow?