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

Example Input: Opaque is the term for matter that does not let any light pass through.
Example Output: What is the term for matter that does not let any light pass through?

Example Input: 40 m/s north of the following represents the velocity of a moving object.
Example Output: Which of the following represents the velocity of a moving object?

Example Input: Each species has a particular way of making a living, which is called its niche.
Example Output:
Each species has a particular way of making a living which is called its what?