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:
Mucous does the esophagus produce for lubrication.
answer:
What does the esophagus produce for lubrication?


question:
The outer layer of the sun is made up of plasma.
answer:

What is the outer layer of the sun made up of?