This article explains how to use the CHOOSE function
CHOOSE(2, "Red", "Blue", "Orange")
CHOOSE (index_num, value1, [value2], ...)
This function returns a value from a list using a given position or index. The values provided to CHOOSE can include references.
Let’s say you have to pick an “Item” from a list.
The function is:
CHOOSE(2, "Item1", "Item2", "Item3")
Learn more about choose in one of the following articles