The thumbnail depicts the coat of arms of Kazakhstan's largest city. Btw even if Bern would be the largest city of Switzerland, it would still be on this quiz, since Switzerland officially does not have a capital.
It's just as easy to find sources showing that the capital of the Netherlands IS the largest city;
(Wiki) Amsterdam (/ˈæmstərdæm/, UK also /ˌæmstərˈdæm/;[10][11] Dutch: [ɑmstərˈdɑm] (About this soundlisten)) is the capital and most populous city of the Netherlands with a population of 872,680[12] within the city proper, 1,380,872 in the urban area[5] and 2,410,960 in the metropolitan area.
(Wiki) Amsterdam (/ˈæmstərdæm/, UK also /ˌæmstərˈdæm/;[10][11] Dutch: [ɑmstərˈdɑm] (About this soundlisten)) is the capital and most populous city of the Netherlands with a population of 872,680[12] within the city proper, 1,380,872 in the urban area[5] and 2,410,960 in the metropolitan area.