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

Input: Consider Input: While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the specimen.

Output: While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the what?


Input: Consider Input: A penguin must do increase muscle mass before molting.

Output: A penguin must do what before molting?


Input: Consider Input: Sporozoites are the cells caused that parasites spread through their host.


Output: What are the cells caused that parasites spread through their host?