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

[EX Q]: Present-day plants that have a complex vascular tissue system are called vasuluar plants.
[EX A]: Present-day plants that have a complex vascular tissue system are called what kind of plants?

[EX Q]: 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.
[EX A]: 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?

[EX Q]: A(n) exoplanet is often discovered because it causes a star to move or to dim.
[EX A]:
What celestial body is often discovered because it causes a star to move or to dim?