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

[EX Q]: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?
[EX A]: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?

[EX Q]: The human body has as many as two trillion lymphocytes, and lymphocytes make up about 25% of all of leukocytes.
[EX A]: The human body has as many as two trillion lymphocytes, and lymphocytes make up about 25% of all of what?

[EX Q]: Objects in motion that return to the same position after a fixed period of time are said to be in harmonic type of motion.
[EX A]:
Objects in motion that return to the same position after a fixed period of time are said to be in what type of motion?