What is the country/region of origin (nationality) on the ds-260 form?

[TheOne2002]

In the question: What is the country/region of origin (nationality)?

I was born in a country and gave up the nationality of my country of origin for that of another country. Which country should I put in this field? Country of birth or current nationality?

Note: I gave up the nationality of my country of birth, meaning, I don’t have this nationality anymore