This matches the Wikipedia page, but the talk page for that Wikipedia page identifies several possible problems. For example: "Missing nations include: Antigua and Barbuda, Bahrain, Barbados, Cabo Verde (Cape Verde), Comoros, Dominica (not the Dominican Republic), Fiji, Grenada, Kiribati, Liechtenstein, Malta, Marshall Islands, Federated States of Micronesia, Monaco, Nauru, Palau, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Seychelles, Solomon Islands, South Sudan, Timor Leste (East Timor), Tonga, Tuvalu, Uzbekistan, and Vanuatu."
If I were able to get an accurate list of all of the countries, I could make a more accurate quiz. But sadly, I do not have all the needed information. I will however post something about this on the quiz.