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

[EX Q]: Neutrophils provide an early, rapid, and nonspecific defense against invading pathogens.
[EX A]: What provides an early, rapid, and nonspecific defense against invading pathogens?

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

[EX Q]: Tissues of marine bony fishes gain excess salts from their surroundings.
[EX A]:
Tissues of marine bony fishes gain what from their surroundings?