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

Example Input: Urea is made in the liver and excreted in urine.
Example Output: What is made in the liver and excreted in urine?

Example Input: Protons and neutrons are made of quarks, which are fundamental particles of matter.
Example Output: A fundamental particle of matter, protons and neutrons are made of these?

Example Input: Sulfur can combine with oxygen to produce sulfur trioxide.
Example Output:
Sulfur can combine with oxygen to produce what?