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

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

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


Ex Input:
10 million years long can a large star be on the main sequence stage.

Ex Output:
How long can a large star be on the main sequence stage?


Ex Input:
Trans fat added to certain foods to keep them fresher longer, increase(s) the risk of heart disease.

Ex Output:

What lipid, added to certain foods to keep them fresher longer, increases the risk of heart disease?