From the way your question is worded, I am assuming that you already know the recipient's country. You could put it in an attribute with the token table,then have a question which would then store the value of the token in the question database. I recently did a project where we encoded the survey subject this way, so that we could store and retrieve the subject with the evaluation.
If you do not know the country, you might capture the IP address, and determine it that way. There are many programs available to do this. Websites use it to target ads to your locale.