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.

Q: 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

A: Gastro-esophageal sphincter sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach.
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Q: Question: What kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules? Answer: hydration reaction

A: Hydration reaction kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules.
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Q: Question: The light-sensing cells in the retina are called rods and what else? Answer: cones

A:
The light-sensing cells in the retina are called rods and cones.
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