The review template includes a free text field with the word "Nationality" as the header for the data element.
I don't think we want to know the providers Nationality. I think there are some who may want to know the provider's racial or ethnic heritage. My suspicion is that whoever created the template simply used the wrong word and ever since, a thousand reviews have struggled with how to handle that initial error.
You could keep the response as a free text answer; but, making it a discrete data field may be help future hobbyists.
For examples:
Scandinavian
Korean
Caribbean
Urban
Black
Mixed: This is where the free text field would go
Think of it NOT in politically correct terms like a standard census bureau form but as a way for people with a fondness for a type to later be able to perform a search on that data.