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

Example Input: A pregnant woman should avoid toxic substances while pregnant.
Example Output: What should a pregnant woman avoid while pregnant?

Example Input: A bow wake is created when the wave source moves faster than the wave propagation speed.
Example Output: What is created when the wave source moves faster than the wave propagation speed?

Example Input: Thrust is the force pushing a rocket.
Example Output:
What is the force pushing a rocket called?