instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Interstitial fluid are all hormones secreted into before entering the circulatory system.
answer:
Where are all hormones secreted into before entering the circulatory system?


question:
Socket secures teeth in the mouth.
answer:
What secures teeth in the mouth?


question:
The speed of sound depends on medium.
answer:

The speed of sound depends on what?