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: Which crust lies deep inside the ocean? Answer: oldest

SOLUTION: Oldest crust lies deep inside the ocean.

PROBLEM: Question: All of the petals together are called what? Answer: corolla

SOLUTION: All of the petals together are called a corolla.

PROBLEM: Question: What is the main function of the circulatory system? Answer: transport materials

SOLUTION:
The main function of the circulatory system is to transport materials.