TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: Which sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach? Answer: gastro-esophageal sphincter

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

PROBLEM: Question: The average global temperature has been rising since the end of what era? Answer: pleistocene

SOLUTION: The average global temperature has been rising since the end of pleistocene era.

PROBLEM: Question: When the helium is gone, the stars become what? Answer: white dwarfs

SOLUTION:
When the helium is gone, the stars become white dwarfs.