What is the largest city in the country that contains the village of Olszewko?
Olszewko, Masovian Voivodeship: Olszewko is a village in the administrative district of Gmina Kuczbork-Osada, within Żuromin County, Masovian Voivodeship, in east-central Poland. Warsaw: Warsaw (Polish: "Warszawa" ; see also other names) is the capital and largest city of Poland.
Warsaw