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

Ex Input:
In the lungs, oxygen diffuses out of the alveoli and into capillaries.

Ex Output:
In the lungs, oxygen diffuses out of the alveoli and into where?


Ex Input:
Processing of filtrate in the proximal tubule helps maintain the ph level in body fluid.

Ex Output:
Processing of filtrate in the proximal tubule helps maintain what level in body fluid?


Ex Input:
Glucose is a carbohydrate that is produced by photosynthesis.

Ex Output:

Which carbohydrate is produced by photosynthesis?