instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Most of the gray matter is on the surface of the brain, surrounding white matter.
answer:
Most of the gray matter is on the surface of the brain, surrounding what other type of matter?


question:
The amniotic egg first evolved in reptiles.
answer:
The amniotic egg first evolved in what species?


question:
Plasma comprises the sun and other stars, as well as lightning and the northern lights.
answer:
What material comprises the sun and other stars, as well as lightning and the northern lights?