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

Example Input: The human body has as many as two trillion lymphocytes, and lymphocytes make up about 25% of all of leukocytes.
Example Output: The human body has as many as two trillion lymphocytes, and lymphocytes make up about 25% of all of what?

Example Input: Some compounds form rigid frameworks called crystals.
Example Output: Some compounds form rigid frameworks called what?

Example Input: The turning driveshaft causes the wheels of the car to turn.
Example Output:
What causes the wheels of the car to turn?