Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: Plasma membranes encloses and defines the borders of cells.
Example Output: What encloses and defines the borders of cells?

Example Input: Hydrocarbons compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization.
Example Output: What compounds, which serve as fuels and are used in manufacturing, are called the driving force of western civilization?

Example Input: Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.
Example Output:
What hydrocarbons contain only single bonds between carbon atoms?