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.

[Q]: Question: Which tool would best help a person observe the parts of a plant cell? Answer: microscope
[A]: A microscope would best help a person observe the parts of a plant cell.

[Q]: Question: When food enters the stomach after a period of fasting, a drop in what initiates the conversion of pepsinogen to pepsin? Answer: ph
[A]: Ph food enters the stomach after a period of fasting, a drop in what initiates the conversion of pepsinogen to pepsin.

[Q]: Question: High levels of radiation can remove electrons from? Answer: metals
[A]:
High levels of radiation can remove electrons from?