I second all four previous comments. Also, technically, there are a lot more nations that start with A and end not in A. Several tribal nations in the US for example (Arapahoe, Apache, etc). I would put "country" and have space for both AfgHanistan and Azerbaijan.
If you would spell Afghanistan correctly, maybe I wouldn't lose points and, as scorpionfan has pointed out, Azerbaijan is another that doesn't end in "a", so there's more than one.
second: antarCtica isn't a country
third: ever heard of Azerbaijan? it doesn't end with an a
Love the geography quizzes though!