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.

[EX Q]: Question: What type of substance is any matter that has a fixed chemical composition and characteristic properties? Answer: pure chemical substance
[EX A]: Pure chemical substance type of substance is any matter that has a fixed chemical composition and characteristic properties.

[EX Q]: Question: What type of acid is often used as a preservative for acidic foods such as fruit juices? Answer: benzoic acid
[EX A]: Benzoic acid type of acid is often used as a preservative for acidic foods such as fruit juices.

[EX Q]: Question: In science, what do you call something that always applies under the same conditions? Answer: scientific law
[EX A]:
In science, something that always applies under the same conditions is called a scientific law.