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: What are drilled to monitor groundwater pollution? Answer: test wells
Test wells are drilled to monitor groundwater pollution.

Question: Of the three basic types of radioactive emissions, what particle is the most penetrating? Answer: gamma
Of the three basic types of radioactive emissions, the gamma particle is the most penetrating.

Question: What causes a blue block to appear blue in the sunlight? Answer: Only blue light is reflected by the block.

A blue block appears blue in the sunlight if only blue light is reflected by the block.