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

[EX Q]: The location of an object in a frame of reference is called position.
[EX A]: The location of an object in a frame of reference is called what?

[EX Q]: Chemical digestion mainly occurs in the small intestine.
[EX A]: Where does chemical digestion mainly occur?

[EX Q]: Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the cesium chloride structure.
[EX A]:
Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the what?