instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Control rods play an important role in the modulation of the nuclear chain reaction.
answer:
What play an important role in the modulation of the nuclear chain reaction?


question:
Are humans a new or old species on the earth?
answer:
Are humans a new or old species on the earth?


question:
Aluminosilicates are formed by replacing some of the si atoms in silicates by al atoms.
answer:

Aluminosilicates are formed by replacing some of the si atoms in silicates by which atoms?