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

Example Input: The opening in the front of the eye is called pupil.
Example Output: What is the opening in the front of the eye called?

Example Input: You call materials that have high resistance to electric current electric insulators.
Example Output: What do you call materials that have high resistance to electric current?

Example Input: The sun is the center of our solar system.
Example Output:
Which of these is the center of our solar system?