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

Input: Consider Input: Force times distance is the equation for work.

Output: Force times distance is the equation for what?

Input: Consider Input: The pupil is the name of the black opening in the eye that lets light enter.

Output: What is the name of the black opening in the eye that lets light enter?

Input: Consider Input: The distinctive appearance of cartilage tissue is due to polysaccharides called chondroitin sulfates.
Output: The distinctive appearance of what tissue is due to polysaccharides called chondroitin sulfates?