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: Which observation demonstrates that light waves travel much faster than sound waves? Answer: An exploding firework is seen before it is heard.
Example Output: An exploding firework is seen before it is heard observation demonstrates that light waves travel much faster than sound waves.

Example Input: Question: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of what exist? Answer: equilibrium
Example Output: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of equilibrium exist.

Example Input: Question: Injuries can be prevented by getting proper what? Answer: rest and recovery
Example Output:
Injuries can be prevented by getting proper rest and recovery.