TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.

SOLUTION: What hydrocarbons contain only single bonds between carbon atoms?

PROBLEM: Elements are pure substances that make up all matter.

SOLUTION: Elements are pure substances that make up what?

PROBLEM: Intervertebral discs are made of fibrocartilage.

SOLUTION:
What are intervertebral discs made of?