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: Chemical reactions follow which laws? Answer: thermodynamics
Example Output: Chemical reactions follow the laws of thermodynamics.

Example Input: Question: Which kind of muscle regulates air flow in lungs? Answer: smooth
Example Output: Smooth muscle regulates air flow in lungs.

Example Input: Question: What occurs when there is little to no rain in a period of time? Answer: droughts
Example Output:
Droughts occurs when there is little to no rain in a period of time.