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

Input: Consider Input: Oil is the most commonly used source of energy in the world.

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

Input: Consider Input: Half-life property of carbon and other elements can be used to date fossils and rocks, among other things.

Output: What property of carbon and other elements can be used to date fossils and rocks, among other things?

Input: Consider Input: At ocean trench location are oceans the deepest.
Output: At which location are oceans the deepest?