Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The cytoskeleton holds cell organelles in place within the cytoplasm.

Answer: What part of the cell holds cell organelles in place within the cytoplasm?

Question: Most of the gray matter is on the surface of the brain, surrounding white matter.

Answer: Most of the gray matter is on the surface of the brain, surrounding what other type of matter?

Question: The cytoskeleton is the skeleton of the cell.

Answer:
What is the skeleton of the cell?