TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Oil is the most commonly used source of energy in the world.

SOLUTION: What is the most commonly used source of energy in the world?

PROBLEM: The brain is the most complex organ in the human body.

SOLUTION: What is the most complex organ in the human body?

PROBLEM: Bathymetric maps are topographic maps that show water depths called.

SOLUTION:
What are topographic maps that show water depths called?