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: Which planet is closest to the sun? Answer: mercury
[EX A]: Mercury is closest to the sun.

[EX Q]: Question: Which state of matter has the lowest density? Answer: gases
[EX A]: Gases have the lowest density.

[EX Q]: Question: What is a three dimensional snycline? Answer: a basin
[EX A]:
A basin is a three dimensional snycline.