Whether Greenland or the UK is your answer depends on whether you consider Greenland to be a country or not. It's an interesting one because Greenland is definitely not a territory or a province, which leaves being a country the only thing it could be. For this quiz, we have used the 196-country template of the Countries of the World quiz, but if you include the countries in the Countries 197 to 204 quiz as well, then Greenland would be the answer.
I have to say that the Seychelles doesn't seem to be the closest country to Madagascar to me. Mozambique, France (Mayotte and Reunion), Comoros and Mauritius - and possibly even Malawi - all look closer to me. Or am I missing something?
I don't think Australia should be considered an island because it's a continent. Also, Papua New Guinea, Indonesia, Brunei, Timor-Leste, Dominican Republic, Haiti, United Kingdom and Ireland Should be on this list. Since they consist only of islands.