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]: Endoscopes are used to explore the body through various orifices or minor incisions.
[EX A]: Endoscopes are used to explore the body through various orifices or these?

[EX Q]: All chemical reactions involve both reactants and products.
[EX A]:
All chemical reactions involve both reactants and what else?