TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Gardasil is the vaccine to prevent infection of hpv.

SOLUTION: What is the vaccine to prevent infection of hpv?

PROBLEM: The sound in a loud classroom is an example of a form of energy.

SOLUTION: Which of the following is an example of a form of energy?

PROBLEM: Earth is the only planet in the solar system that has water, which is essential for human life, present in all three of its states.

SOLUTION:
Earth is the only planet in the solar system that has what element, which is essential for human life, present in all three of its states?