Context: Switzerland, officially the Swiss Confederation, is a federal republic in Europe. It consists of 26 cantons, and the city of Bern is the seat of the federal authorities. 
The country is situated in Western-Central Europe, and is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland is a landlocked country geographically divided between the Alps, the Swiss Plateau and the Jura, spanning an area of . While the Alps occupy the greater part of the territory, the Swiss population of approximately eight million people is concentrated mostly on the plateau, where the largest cities are to be found: among them are the two global cities and economic centres Zürich and Geneva., Essen (Latin: "Assindia") is a city in North Rhine-Westphalia, Germany. Its population of approximately 589,000 makes it the ninth-largest city in Germany. It is the central city of the northern (Ruhr) part of the Rhine-Ruhr metropolitan area and seat to several of the region's authorities., Warsaw (; see also other names) is the capital and largest city of Poland. It stands on the Vistula River in east-central Poland, roughly from the Baltic Sea and from the Carpathian Mountains. Its population is estimated at 1.750 million residents within a greater metropolitan area of 3.105 million residents, which makes Warsaw the 9th most-populous capital city in the European Union. The city limits cover , while the metropolitan area covers ., Ukraine (tr. ) is a sovereign state in Eastern Europe, bordered by Russia to the east and northeast, Belarus to the northwest, Poland and Slovakia to the west, Hungary, Romania, and Moldova to the southwest, and the Black Sea and Sea of Azov to the south and southeast, respectively. Ukraine is currently in territorial dispute with Russia over the Crimean Peninsula which Russia annexed in 2014 but which Ukraine and most of the international community recognise as Ukrainian. Including Crimea, Ukraine has an area of , making it the largest country entirely within Europe and the 46th largest country in the world. It has a population of about 44.5 million, making it the 32nd most populous country in the world., Operation Barbarossa (German: "Unternehmen Barbarossa") was the code name for Nazi Germany's invasion of the Soviet Union during World War II, which was launched on Sunday 22 June 1941. The operation was driven by an ideological desire to conquer the Western Soviet Union so that it could be repopulated by Germans, to use Slav labour for the war effort, to seize the oil resources in the Caucasus and to seize the grain supply in the Ukraine., The Krupp family (see pronunciation), a prominent 400-year-old German dynasty from Essen, have become famous for their production of steel, artillery, ammunition, and other armaments. The family business, known as Friedrich Krupp AG, was the largest company in Europe at the beginning of the 20th century. It was important to weapons development and production in both world wars. One of the most powerful dynasties in European history, for 400 years Krupp flourished as the premier weapons manufacturer for Germany. From the Thirty Years' War until the end of the Second World War, they produced everything from battleships, U-boats, tanks, howitzers, guns, utilities, and hundreds of other commodities., Luxembourg, officially the Grand Duchy of Luxembourg, is a landlocked country in western Europe. It is bordered by Belgium to the west and north, Germany to the east, and France to the south. Its capital, Luxembourg City, is, together with Brussels and Strasbourg, one of the three official capitals of the European Union and the seat of the European Court of Justice, the highest juridical authority in the EU. Its culture, people and languages are highly intertwined with its neighbors, making it essentially a mixture of French and Germanic cultures. The repeated invasions by its neighbor countries, especially in World War II, resulted in the country's strong will for mediation between France and Germany and led to the foundation of the European Union., The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1919, exactly five years after the assassination of Archduke Franz Ferdinand. The other Central Powers on the German side of World War I signed separate treaties. Although the armistice, signed on 11 November 1918, ended the actual fighting, it took six months of Allied negotiations at the Paris Peace Conference to conclude the peace treaty. The treaty was registered by the Secretariat of the League of Nations on 21 October 1919., The Wehrmacht (lit. "defence force") was the unified armed forces of Nazi Germany from 1935 to 1946. It consisted of the "Heer" (army), the "Kriegsmarine" (navy) and the "Luftwaffe" (air force). The designation "Wehrmacht" for Nazi Germany's military replaced the previously used term, "Reichswehr" (191935), and was the manifestation of Nazi Germany's efforts to rearm the nation to a greater extent than the Treaty of Versailles permitted., Sevastopol or traditionally Sebastopol (or  ) is a city located in the southwestern region of the Crimean Peninsula on the Black Sea. As a result of the 2014 Russian annexation, the city is administered as a federal city of the Russian Federation, though Ukraine and most of the UN member countries continue to regard Sevastopol as a city with special status within Ukraine., Belgium , officially the Kingdom of Belgium, is a sovereign state in Western Europe bordered by France, the Netherlands, Germany, Luxembourg, and the North Sea. It is a small, densely populated country which covers an area of and has a population of about 11 million people. Straddling the cultural boundary between Germanic and Latin Europe, Belgium is home to two main linguistic groups: the Dutch-speaking, mostly Flemish community, which constitutes about 59% of the population, and the French-speaking, mostly Walloon population, which comprises 41% of all Belgians. Additionally, there is a small group of German-speakers who live in the East Cantons located around the High Fens area, and bordering Germany., An armoured train is a railway train protected with armour. Armoured trains usually include railroad cars armed with artillery and machine guns. They were mostly used during the late 19th and early 20th century, when they offered an innovative way to quickly move large amounts of firepower. Most countries discontinued their use - road vehicles became much more powerful and offered more flexibility, and train tracks proved too vulnerable to sabotage as well as to attacks from the air. However, the Russian Federation used improvised armored trains in the Second Chechen War of 1999-2009., The Kriegsmarine ("War Navy") was the navy of Nazi Germany from 1935 to 1945. It superseded the "Kaiserliche Marine" (German Imperial Navy) of World War I and the inter-war "Reichsmarine". The "Kriegsmarine" was one of three official branchesalong with the "Heer (Army)" and the "Luftwaffe (Air Force)"of the Wehrmacht, the armed forces of Nazi Germany., U-boat is the anglicised version of the German word U-Boot , a shortening of Unterseeboot, literally "undersea boat". While the German term refers to any submarine, the English one (in common with several other languages) refers specifically to military submarines operated by Germany, particularly in the First and Second World Wars. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic warfare role (commerce raiding), enforcing a naval blockade against enemy shipping. The primary targets of the U-boat campaigns in both wars were the merchant convoys bringing supplies from Canada, the British Empire, and the United States to the United Kingdom and (during the Second World War) to the Soviet Union and the Allied territories in the Mediterranean., Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf., The Luftwaffe was the aerial warfare branch of the combined German Wehrmacht military forces during World War II. Germany's military air arms during the First World War, the "Luftstreitkräfte" of the Army and the "Marine-Fliegerabteilung" of the Navy, had been disbanded in May 1920 as a result of the terms of the Treaty of Versailles which stated that Germany was forbidden to have any air force., The Black Sea is a body of water between Eastern Europe and Western Asia, bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is supplied by a number of major rivers, such as the Danube, Dnieper, Rioni, Southern Bug, and Dniester. The Black Sea has an area of (not including the Sea of Azov), a maximum depth of , and a volume of . It is constrained by the Pontic Mountains to the south and by the Caucasus Mountains to the east, and features a wide shelf to the northwest. The longest east-west extent is about ., The Reichswehr (English: Imperial Defence) formed the military organisation of Germany from 1919 until 1935, when it was united with the new "Wehrmacht" (Defence Force)., A railway gun, also called a railroad gun, is a large artillery piece, often surplus naval artillery, mounted on, transported by, and fired from a specially designed railway wagon. Many countries have built railway guns, but the best known are the large Krupp-built pieces used by Germany in World War I and World War II. Smaller guns were often part of an armoured train., The Crimean Peninsula ("Krymskiy poluostrov;" , "Kryms'ky pivostriv"), also known simply as Crimea ( "Krym" "Krym"), is a major land mass on the northern coast of the Black Sea that is almost completely surrounded by both the Black Sea and the smaller Sea of Azov to the northeast. The peninsula is located south of the Ukrainian region of Kherson and west of the Russian region of Kuban. It is connected to Kherson Oblast by the Isthmus of Perekop and is separated from Kuban by the Strait of Kerch. The Arabat Spit is located to the northeast, a narrow strip of land that separates a system of lagoons named Sivash from the Sea of Azov., The Home Army (abbreviated AK) was the dominant Polish resistance movement in Poland occupied by Nazi Germany and the Soviet Union during World War II. It was formed in February 1942 from the "Zwizek Walki Zbrojnej" (Armed Resistance). Over the next two years, it absorbed most other Polish underground forces. Its allegiance was to the Polish Government-in-Exile, and it constituted the armed wing of what became known as the "Polish Underground State"., The Battle of France, also known as the Fall of France, was the German invasion of France and the Low Countries in 1940 during the Second World War. In six weeks from 10 May 1940, German forces defeated Allied forces by mobile operations and conquered France, Belgium, Luxembourg and the Netherlands, bringing land operations on the Western Front to an end until 6 June 1944. Italy entered the war on 10 June 1940 and attempted an invasion of France., Nazi Germany is the common English name for the period in German history from 1933 to 1945, when Germany was governed by a dictatorship under the control of Adolf Hitler and the Nazi Party (NSDAP). Under Hitler's rule, Germany was transformed into a fascist state in which the Nazi Party took totalitarian control over nearly all aspects of life. The official name of the state was "Deutsches Reich" from 1933 to 1943 and "Großdeutsches Reich" ("Greater German Reich") from 1943 to 1945. The period is also known under the names the Third Reich and the National Socialist Period (abbreviated as "NS-Zeit"). The Nazi regime came to an end after the Allied Powers defeated Germany in May 1945, ending World War II in Europe., Schwerer Gustav ( English : Heavy Gustaf or Great Gustaf ) was the name of a German 80 cm ( 31.5 in . ) railway gun . It was developed in the late 1930s by Krupp as siege artillery for the explicit purpose of destroying the main forts of the French Maginot Line , the strongest fortifications then in existence . The fully assembled gun weighed nearly 1,350 tonnes , and could fire shells weighing seven tonnes to a range of 47 kilometres ( 29 mi ) . The gun was designed in preparation for the Battle of France , but was not ready for action when the battle began , and in any case the Wehrmacht 's Blitzkrieg offensive through Belgium rapidly outflanked and isolated the Maginot Line 's static defenses , forcing them to surrender uneventfully and making their destruction unnecessary . Gustav was later employed in the Soviet Union at the siege of Sevastopol during Operation Barbarossa , where among other things , it destroyed a munitions depot buried in the bedrock under a bay . The gun was moved to Leningrad , and may have been intended to be used in the Warsaw Uprising like other German heavy siege pieces , but the rebellion was crushed before it could be prepared to fire . Gustav was destroyed near the end of the war in 1945 to avoid capture by the Red Army . It was the largest - calibre rifled weapon ever used in combat , the heaviest mobile artillery piece ever built in terms of overall weight , and fired the heaviest shells of any artillery piece . It is only surpassed in calibre by the British Mallet 's Mortar and the American Little David mortar ( both 36 inch ; 914 mm ) ., Russia (from the  Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140 million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara., The Soviet Union, officially the Union of Soviet Socialist Republics (USSR " ) was a socialist state in Eurasia that existed from 1922 to 1991. A union of multiple subnational republics, its government and economy were highly centralized. The Soviet Union was a one-party federation, governed by the Communist Party with Moscow as its capital., The Maginot Line, named after the French Minister of War André Maginot, was a line of concrete fortifications, obstacles and weapon installations that France constructed on the French side of its borders with Switzerland, Germany and Luxembourg during the 1930s. The line did not extend through to the English Channel because the French military did not want to offend Belgium given its policy of neutrality. The line was a response to France's experience in World War I and was constructed during the run-up to World War II, shortly after the Locarno Conference that gave rise to a fanciful and optimistic "Locarno spirit"., The Warsaw Uprising was a major World War II operation by the Polish resistance Home Army to liberate Warsaw from German occupation. The uprising was timed to coincide with the Soviet Union's Red Army approaching the eastern suburbs of the city and the retreat of German forces. However, the Soviet advance stopped short, enabling the Germans to regroup and demolish the city while defeating the Polish resistance, which fought for 63 days with little outside support. The Uprising was the largest single military effort taken by any European resistance movement during World War II., Friedrich Carl Krupp (Essen, 17 July 1787  Essen, 8 October 1826) was a German steel manufacturer and founder of the Krupp family commercial empire that is now subsumed into ThyssenKrupp AG., The Netherlands  is the main constituent country of the Kingdom of the Netherlands. It is a densely populated country located in Western Europe with three island territories in the Caribbean. The European part of the Netherlands borders Germany to the east, Belgium to the south, and the North Sea to the northwest, sharing maritime borders with Belgium, the United Kingdom, and Germany. The largest cities in the Netherlands are Amsterdam, Rotterdam, The Hague and Utrecht. Amsterdam is the country's capital, while The Hague holds the Dutch seat of government and parliament. The name "Holland" is used to refer informally to the whole of the country of the Netherlands., Subject: schwerer gustav, Relation: manufacturer, Options: (A) belarus (B) friedrich krupp ag (C) germany (D) kherson (E) krupp (F) nizhny novgorod (G) romania (H) seat (I) soviet union (J) strasbourg (K) train (L) turkey (M) warsaw (N) yekaterinburg
Output: friedrich krupp ag