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

Example Input: Certain air pollutants form acid liquid when dissolved in water droplets in the air.
Example Output: Certain air pollutants form which liquid when dissolved in water droplets in the air?

Example Input: In the lungs, oxygen diffuses out of the alveoli and into capillaries.
Example Output: In the lungs, oxygen diffuses out of the alveoli and into where?

Example Input: Fire extinguisher of the following items is necessary in a laboratory for safety purposes.
Example Output:
Which of the following items is necessary in a laboratory for safety purposes?