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

Example Input: All enzymes have an optimal temperature and ph.
Example Output: All enzymes have an optimal temperature and what?

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: When exposed to ultraviolet, some substances, such as minerals, glow in characteristic visible wavelengths, in a process called fluorescence.
Example Output:
When exposed to ultraviolet, some substances, such as minerals, glow in characteristic visible wavelengths, a process called this?