The Okanagan Country, also known as the Okanagan Valley, is a region located in the Canadian province of British Columbia, and the U.S. state of Washington (where it is spelled the Okanogan Country), defined by the basin of Okanagan Lake and the Okanagan River.
 With an estimated 400,000 residents, the Okanagan Country spans from the Thompson Plateau near Grindrod, British Columbia in the Okanagan to the Okanagan Highland near Douglas County, Washington in the Okanogan.
 The largest city in the Canadian portion is Kelowna, with a metropolitan population of 194,882  residents as of 2016, while the largest city in the American portion is Omak, with 4,881 residents as of 2011.
 The region took its current name in honor of the Okanagan term, "ukʷnaqín".
 The mild climate and close proximity to lakes, rivers and mountainous regions make the Okanagan Country an outdoor recreational destination.
 The region's economy is dominated by the primary industries of agriculture and forestry, although economic diversification has also occurred with retirement communities and recreational tourism.
 The American portion is considered to be more remote than the Canadian division, with approximately 10 percent of the population.
Osaka (大阪市 , Ōsaka-shi ) (] ;    ) is a designated city in the Kansai region of Japan.
 It is the capital city of Osaka Prefecture and the largest component of the Keihanshin Metropolitan Area, the second largest metropolitan area in Japan and among the largest in the world with over 19 million inhabitants.
 Situated at the mouth of the Yodo River on Osaka Bay, Osaka is the second largest city in Japan by daytime population after Tokyo's 23 wards and the third largest city by nighttime population after Tokyo's 23 wards and Yokohama, serving as a major economic hub for the country.
A primate city (Latin: "prime, first rank") is the largest city in its country or region, disproportionately larger than any others in the urban hierarchy.
 A 'primate city distribution' is a rank-size distribution that has one very large city with many much smaller cities and towns, and no intermediate-sized urban centres: a King effect, visible as an outlier on an otherwise linear graph, when the rest of the data fit a power law or stretched exponential function.
 The 'law of the primate city' was first proposed by the geographer Mark Jefferson in 1939.
 He defines a primate city as being "at least twice as large as the next largest city and more than twice as significant."
 A primate city is number one in its country in most aspects, like politics, economy, media, culture and universities.
Olszewko is a village in the administrative district of Gmina Kuczbork-Osada, within Żuromin County, Masovian Voivodeship, in east-central Poland.
 It lies approximately 4 km south of Kuczbork-Osada, 10 km east of Żuromin, and 114 km north-west of Warsaw.
Baku ( , ; Azerbaijani: "Bakı" , ] ) is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region.
 Baku is located 28 m below sea level, which makes it the lowest lying national capital in the world and also the largest city in the world located below sea level.
 It is located on the southern shore of the Absheron Peninsula, alongside the Bay of Baku.
 At the beginning of 2009, Baku's urban population was estimated at just over two million people.
 Officially, about 25 percent of all inhabitants of the country live in Baku's metropolitan area.
South Dakota lies in both the Mountain Time Zone and the Central Time Zone.
 Mountain Time roughly contains the western half of the state, but not all of it.
 Rapid City is the largest city in the Mountain Time portion of the state.
 Central Time contains the eastern half of the state and roughly more of the state than the Mountain Time Zone and includes the state capital Pierre and the largest city, Sioux Falls.
Bangalore/Bengaluru is the capital and largest city in the Indian state of Karnataka.
 With a population of over 15 million (as of January 2016), Bengaluru is the third largest city in India and 27th largest city in the world.
 Bengaluru is one of the most ethnically diverse cities in the country, with over 62% of the city's population comprising migrants from other parts of India.
 Historically a multicultural city, Bengaluru has experienced a dramatic social and cultural change with the advent of the liberalization and expansion of the information technology and business process outsourcing industries in India.
 IT companies in Bengaluru employ over 35% of India's pool of 1 million IT professionals.
The A2 (Albanian: "Autostrada 2" ) is the third largest motorway in Albania spanning 46.5 km .
 As it connects Fier, the sixth largest city, to Vlorë, the third largest city in the country and the largest city in southern Albania, the motorway represents a major north–south transportation corridor and a significant part of the Adriatic–Ionian motorway.
 The A2 is also the starting point of the Pan-European Corridor VIII.
 The motorway consists of two traffic lanes and an emergency lane in each driving direction separated by a central reservation.
 National significance of the motorway is reflected through its positive economic impact on the cities and towns it connects as well as its importance to tourism in Albania.
 It is currently, mostly under construction.
Warsaw (Polish: "Warszawa" ; see also other names) is the capital and largest city of Poland.
 It stands on the Vistula River in east-central Poland, roughly 260 km from the Baltic Sea and 300 km from the Carpathian Mountains.
 Its population is officially estimated at 1.750 million residents within a greater metropolitan area of 3.101 million residents, which makes Warsaw the 9th most-populous capital city in the European Union.
 The city limits cover 516.9 km2 , while the metropolitan area covers 6100.43 km2 .
Visakhapatnam (] ; also known as Vizag) is the largest city and "Financial Capital" of the Indian state of Andhra Pradesh.
 The city is the administrative headquarters of Visakhapatnam district and Eastern Naval Command.
 Its geographical location is amidst Eastern Ghats mountain range and the coast of Bay of Bengal.
 It is the most populous city in the state with a population of 2,035,922 making it 14th largest city in the country.
 It is also the 9th most populous metropolitan area in India with a population of 53,40,000.
 The economy of the city is the tenth largest in the country, with a GDP of $43.5 billion.

Question: What is the largest city in the country that contains the village of Olszewko?
Answer: Warsaw