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

Example Input: The cytoskeleton holds cell organelles in place within the cytoplasm.
Example Output: What part of the cell holds cell organelles in place within the cytoplasm?

Example Input: Filter feeders called rotifers collect digestive and excretory wastes in cloacal bladder primitive organ.
Example Output: Filter feeders called rotifers collect digestive and excretory wastes in what primitive organ?

Example Input: Coal is the source of most electricity.
Example Output:
What is the source of most electricity?