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.

Example Input: Question: What is the hollow and muscular balloon-shaped organ that collects urine? Answer: urinary bladder
Example Output: The urinary bladder is the hollow and muscular balloon-shaped organ that collects urine.

Example Input: Question: Which of these shows how frozen water changes as the temperature of the air increases? Answer: Solid -> liquid -> gas
Example Output: Solid -> liquid -> gas of these shows how frozen water changes as the temperature of the air increases.

Example Input: Question: The outer surface of the heart changes from positive to negative during what? Answer: depolarization
Example Output:
The outer surface of the heart changes from positive to negative during depolarization.