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

[EX Q]: Compounds containing an atom of nitrogen element, bonded in a hydrocarbon framework, are classified as amines.
[EX A]: Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?

[EX Q]: Some plants have stolons, or stems, that run along the ground and are commonly called runners.
[EX A]: Some plants have stolons, or stems, that run along the ground and are commonly called what?

[EX Q]: The light-sensing cells in the retina are called rods and cones.
[EX A]:
The light-sensing cells in the retina are called rods and what else?