In this case it's easier to use a checkbox question with just one answer option checked by default... and play with relavance field
for example if you only target USA & UK:
1) set a multiple choice question
2) create one answer option
3) tick it by default (there is an icon for that near answer option creation)
4) In the relevance field set your formula, something like:
Code:
((Q1!='us') || (Q1!='uk'))
(in clear: true if not uk or not us)
5) hide this question
6) Apply your quota if this question is relevant