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

[Q]: The refrigerator door contains iron of the following statements best explains why magnets usually stick to a refrigerator door.
[A]: Which of the following statements best explains why magnets usually stick to a refrigerator door?


[Q]: Six many neutrons do 99% of carbon atoms have.
[A]: How many neutrons do 99% of carbon atoms have?


[Q]: Nonrenewable resources cannot be replaced as easily as it is consumed.
[A]:
What type of resource cannot be replaced as easily as it is consumed?