I'm guessing for the sake of competition they aren't counting pizza as Italian cuisine - otherwise I imagine it would be Italy by an overwhelming majority. However, I know people disagree as to whether pizza is actually Italian cuisine or not (I don't care enough to research the matter but a lot of people argue it is Italian-American and not Italian-Italian if you get my drift).
Saying to take it up with the source is no excuse for an ambiguous or incorrect question or answer. Mediterranean isn't a cuisine, except in the minds of some Americans.