In the U. S., nodding your head up and down is interpreted as a sign of acceptance and understanding. Which of the following cultures is this same behavior interpreted differently?

Indeed, nodding has different connotation, depending on the culture

Explanation:

As the question first said, U. S. is one of those countries, along with those from South America and some from Europe that indicate either acceptance/uderstanding or respect. Nevertheless the same gesture may indicate a refusal, which is shown in countries such as Greece (Partially), Iran, and countries around Russia.