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 are intervertebral discs made of? Answer: fibrocartilage

SOLUTION: Intervertebral discs are made of fibrocartilage.

PROBLEM: Question: What is an adaptation? Answer: favorable trait

SOLUTION: A(n) favorable trait is an adaptation.

PROBLEM: Question: Where does most natural gas come from? Answer: wells that produce petroleum

SOLUTION:
Wells that produce petroleum does most natural gas come from.