instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The outer layer of the sun is made up of plasma.
answer:
What is the outer layer of the sun made up of?

question:
Cells are the basic building blocks of the human body.
answer:
What are the basic building blocks of the human body?

question:
Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the cesium chloride structure.
answer:
Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the what?