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

Ex Input:
Three many families are known quarks divided into.

Ex Output:
How many families are known quarks divided into?


Ex Input:
Respiratory acidosis is considered to be problematic because excess co2 in blood.

Ex Output:
Why is respiratory acidosis considered to be problematic?


Ex Input:
Is the heat of reaction for an endothermic reaction is positive.

Ex Output:

Is the heat of reaction positive or negative for an endothermic reaction?