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

Input: Consider Input: Gastro-esophageal sphincter sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach.

Output: Which sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach?


Input: Consider Input: Temperature and sky conditions are both used to describe weather.

Output: Which two observations are both used to describe weather?


Input: Consider Input: Humans possess greater diversity of genetics type, compared to laboratory animals.
Output: Humans possess greater diversity of what type, compared to laboratory animals?