instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Through tubular ducts part do exocrine glands discharge their contents.
answer:
Through what part do exocrine glands discharge their contents?


question:
Oxygen is transferred through capillaries.
answer:
Which blood vessels is oxygen transferred through?


question:
Clouds are formed from water droplets.
answer:

Clouds are formed from what?