instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
2 hydrogen, 1 oxygen atoms combine to make up a molecule of water.
answer:
What atoms combine to make up a molecule of water?


question:
Momentum is directly related to both mass and velocity.
answer:
Momentum is directly related to both mass and?


question:
Clear mucus is secreted before ejaculation to neutralize acidic urine remaining in the urethra.
answer:

What is secreted before ejaculation to neutralize acidic urine remaining in the urethra?