In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: if two objects have the same charge then those two materials will effect each other how? Answer: unattract.
[EX A]: if two objects have the same charge then those two materials will repel each other

[EX Q]: Question: Pollution is a source of what? Answer: dirtying agents.
[EX A]: pollution is a source of pollutants

[EX Q]: Question: A moth that experiences a metamorphosis will change? Answer: shape.
[EX A]:
a moth undergoes metamorphosis