Interesting argument. Is there any source that would suggest "Saint" is an incorrect spelling for either capital? I checked both country's constitutions, and found no mention of the capital cities.
In the meantime, since "St." and "Saint" are frequently used interchangeably for both cities, I see no reason to change the answers here :)
Other than that, enjoyed the quiz.
In the meantime, since "St." and "Saint" are frequently used interchangeably for both cities, I see no reason to change the answers here :)