Question: The Prussian Trust is registered in the capital city of what German state?
Context: In 1905 the Prussian state railways grouped six-coupled, medium-powered, goods train, tank locomotives into its Class G 3.  In addition to standard locomotives, there were also 285 G 3s that were not built to German state railway norms, because they had been built, in most cases, before the foundation of the Prussian state railways. The Prussian T 13 was a series of tank locomotives built in large numbers for the various German state railways, notably the Prussian state railways, and the Deutsche Reichsbahn during the early part of the 20th century. The monarchs of Prussia were members of the House of Hohenzollern who were the hereditary rulers of the former German state of Prussia from its founding in 1525 as the Duchy of Prussia.  The Duchy had evolved out of the Teutonic Order, a Roman Catholic crusader state and theocracy located along the eastern coast of the Baltic Sea.  The Teutonic Knights were under the leadership of a Grand Master, the last of whom, Albert, converted to Protestantism and secularized the lands, which then became the Duchy of Prussia.  The Duchy was initially a vassal of the Kingdom of Poland, as a result of the terms of the Prussian Homage whereby Albert was granted the Duchy as part of the terms of peace following the Prussian War.  When the main line of Prussian Hohenzollerns died out in 1618, the Duchy passed to a different branch of the family, who also reigned as Electors of Brandenburg in the Holy Roman Empire.  While still nominally two different territories, Prussia under the suzerainty of Poland and Brandenburg under the suzerainty of the Holy Roman Empire, the two states are known together historiographically as Brandenburg-Prussia.  Following the Second Northern War, a series of treaties freed the Duchy of Prussia from any vassalage to any other state, making it a fully sovereign Duchy in its own right.  This complex situation (where the Hohenzollern ruler of the independent Duchy of Prussia was also a subject of the Holy Roman Emperor as Elector of Brandenburg) laid the eventual groundwork for the establishment of the Kingdom of Prussia in 1701.  For diplomatic reasons, the rulers of the state were known as the King in Prussia from 1701 to 1772; largely because they still owed fealty to the Emperor as Electors of Brandenburg, the "King in Prussia" title (as opposed to "King of Prussia") avoided offending the Emperor.  As the Prussian state grew through several wars and diplomatic moves throughout the 18th century, it became apparent that Prussia had become a Great Power that did not need to submit meekly to the Holy Roman Empire.  By 1772, the pretense was dropped, and the style "King of Prussia" was adopted.  Thus it remained until 1871, when in the aftermath of the Franco-Prussian War, the King of Prussia Wilhelm I was crowned German Emperor.  From that point forward, though the Kingdom of Prussia retained its status as a constituent state of the German Empire, all remaining Kings of Prussia also served as German Emperor, and that title took precedence. Düsseldorf (] , Low Franconian, Ripuarian: "Düsseldörp" [ˈdʏsl̩dœɐ̯p] ) is the capital city of the German state of North Rhine-Westphalia and the seventh most populous city in Germany.  Düsseldorf is an international business and financial centre, renowned for its fashion and trade fairs.  The city is headquarters to one Fortune Global 500 and two DAX companies.  Messe Düsseldorf organises nearly one fifth of premier trade shows. The State of Mecklenburg (German: "Land Mecklenburg") was a subdivision of the Soviet occupation zone (until 1949) and state of East Germany (from 1949) which corresponds widely to the present-day German state Mecklenburg-Vorpommern.  The state was originally formed as administrative division State of Mecklenburg-Vorpommern (German: "Land Mecklenburg-Vorpommern") by the Soviet Military Administration in Germany (SMAD) in July 1945.  It consisted of the 1934 established Mecklenburg (a merger by the NSDAP-Gauleiter Friedrich Hildebrandt of the free states of Mecklenburg-Schwerin and Mecklenburg-Strelitz) and parts of the former Prussian provinces of Pommern (Western Pomerania to the Oder-Neisse-Line) and Hanover (Amt Neuhaus).  The city of Świnoujście was handed over in October 1945 to Poland (became part of Szczecin Voivodeship).  In November 1945, a transfer of small territories along the Inner German border to the former Province of Schleswig-Holstein was carried out (Barber-Lyashchenko-Agreement).  About 2.1 million people were estimated to live in Mecklenburg in 1946.  From 1947, the term "Vorpommern" was excluded from the official name as the SMAD feared that this would support revisionist actions against the Polish parts (in particular Farther Pomerania).  Compared to the administrative divisions of Nazi Germany, it comprised the "Gaue" Mecklenburg and parts of Pomerania and Eastern Hanover. The Gauliga Hessen was the highest football league in the German state of Hesse and the Prussian province of Hesse-Nassau from 1933 to 1945.  From 1941, it was renamed Gauliga Kurhessen.  Shortly after the formation of the league, the Nazis reorganised the administrative regions in Germany, and the "Gau" "Electoral Hesse" replaced the Prussian province and the Peoples State. The Minister-President of Hesse (German: "Ministerpräsident des Landes Hesse" ), also referred to as the Premier or Minister President (also translated into English as the Prime minister of Hessen), is the head of government of the German state of Hesse.  The position in its current form was created in 1946, when the provisional state of Greater Hesse was renamed.  Greater Hesse had been formed in 1945 after the Second World War from the Prussian Provinces of Kurhessen and Nassau (formed from the Prussian Province of Hesse-Nassau in 1944) and the People's State of Hesse.  The current Minister-President is Volker Bouffier, heading a coalition government between the Christian Democrats and the Greens.  Bouffier succeeded Roland Koch following his departure from active politics. The Gauliga Württemberg was the highest football league in the German state of Württemberg and the Prussian province of Hohenzollern from 1933 to 1945.  Shortly after the formation of the league, the Nazis reorganised the administrative regions in Germany, and the "Gau Württemberg-Hohenzollern" replaced the Prussian province and state of Württemberg. The German State Railway Wagon Association (German: "Deutscher Staatsbahnwagenverband" ) or DWV was an association of the German state railways "Länderbahnen" founded in 1909.  The purpose of the association was to guarantee the unrestricted exchange of goods wagons between the member railway administrations.  The German State Railway Wagon Association could, unlike the "Prussian State Railway Wagon Association", stipulate standard wagon designs for the whole of Germany.  It developed a total of eleven different wagon types, the "Verbandsbauart" (literally: association type) or "DWV" wagons.  In addition to entire goods wagons, types of bogie were also specified. The Prussian Trust, or Prussian Claims Society, (German: "Preußische Treuhand GmbH & Co.  KGaA" ) is a corporation registered in Düsseldorf, founded in 2000 as "Preußische Treuhand GmbH" by some descendants of German expellees, and supported by some officials of the Landsmannschaft Schlesien organization.  It seeks to claim compensation from Poland and the Czech Republic, among others, for property confiscated from Germans expelled from territories which after World War II became parts of Poland and Czechoslovakia.
Answer: North Rhine-Westphalia