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

[EX Q]: Respiratory acidosis is considered to be problematic because excess co2 in blood.
[EX A]: Why is respiratory acidosis considered to be problematic?

[EX Q]: Soft of these best describes the way a feather feels.
[EX A]: Which of these BEST describes the way a feather feels?

[EX Q]: Molecules of cholesterol helps the plasma membrane keep its shape.
[EX A]:
What helps the plasma membrane keep its shape?