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 Input:
Question: What type of substance is any matter that has a fixed chemical composition and characteristic properties? Answer: pure chemical substance

Ex Output:
Pure chemical substance type of substance is any matter that has a fixed chemical composition and characteristic properties.

Ex Input:
Question: What is defined as the velocity of the object at a given moment? Answer: instantaneous velocity

Ex Output:
Instantaneous velocity is defined as the velocity of the object at a given moment.

Ex Input:
Question: What type of compound contains atoms of two or more different elements in its ring structure? Answer: heterocyclic

Ex Output:
A heterocyclic compound contains atoms of two or more different elements in its ring structure.