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

Example Input: Phospholipids are the main component of the cell membrane.
Example Output: What is the main makeup of the cell membrane?

Example Input: Aqueous solution is used to describe a solution in which water is the solvent.
Example Output: What term is used to describe a solution in which water is the solvent?

Example Input: The ph scale is used to succinctly communicate the acidity or basicity of a solution.
Example Output:
What scale is used to succinctly communicate the acidity or basicity of a solution?