Japan's flag isn't on this quiz. You're probably looking at Bangladesh's flag, and that "eggnoggy" color is the selection color. If you click a different section of a flag, you'll select that section instead.
QM featured the first two, but they require some CSS work on his end before they can be featured. He doesn't have the time to do that for every feature.
The problem with this one in particular is the saint lucia flag the parts just sometimes change color when not supposed to so since it's first I followed it and got them wrong.
St. Lucia, Armenia, Palau, and Bangladesh