TASK DEFINITION: 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.
PROBLEM: Question: What describes the amount of solute in a solution? Answer: tonicity

SOLUTION: Tonicity describes the amount of solute in a solution.

PROBLEM: Question: Corals build hard exoskeletons that grow to become what? Answer: coral reefs

SOLUTION: Corals build hard exoskeletons that grow to become coral reefs.

PROBLEM: Question: What is the leading cause of death worldwide? Answer: coronary artery disease

SOLUTION:
Coronary artery disease is the leading cause of death worldwide.