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

[EX Q]: Phospholipids are the main component of the cell membrane.
[EX A]: What is the main makeup of the cell membrane?

[EX Q]: Mercury is not a solid even at room temperature.
[EX A]: Which metal is not a solid even at room temperature?

[EX Q]: Isothermal kind of process is boiling.
[EX A]:
What kind of process is boiling?