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: Exposure to what can increase the amount of pigment in the skin and make it appear darker? Answer: ultraviolet radiation
Example Output: Exposure to ultraviolet radiation can increase the amount of pigment in the skin and make it appear darker.

Example Input: Question: What type of hydrocarbon is coal? Answer: solid
Example Output: Solid type of hydrocarbon is coal.

Example Input: Question: What is the layer of tissue between the body and shell called? Answer: mantle
Example Output:
Mantle is the layer of tissue between the body and shell.