instruction:
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.
question:
Question: What is the hollow and muscular balloon-shaped organ that collects urine? Answer: urinary bladder
answer:
The urinary bladder is the hollow and muscular balloon-shaped organ that collects urine.


question:
Question: Which has a higher metabolic rate, a mouse or an elephant? Answer: mouse
answer:
Mouse has a higher metabolic rate, a mouse or an elephant.


question:
Question: What monitors the level of carbon dioxide in the blood? Answer: the brain stem
answer:

The brain stem monitor(s) the level of carbon dioxide in the blood.