Information:  - Baden-Württemberg is a state in Germany located in the southwest, east of the Upper Rhine. It is Germanys third largest state in terms of size and population, with an area of and 10.8 million inhabitants. The state capital and largest city is Stuttgart.  - Sigmaringen is a town in southern Germany, in the state of Baden-Württemberg. Situated on the upper Danube, it is the capital of the Sigmaringen district.  - The Kingdom of Prussia was a German kingdom that constituted the state of Prussia between 1701 and 1918 and included parts of present-day Germany, Poland, Russia, Lithuania, Denmark, Belgium and the Czech Republic. It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg, where its capital was Berlin.  - Karl , Prince of Hohenzollern - Sigmaringen ( 20 February 1785 -- 11 March 1853 ) was Prince of Hohenzollern - Sigmaringen from 1831 to 1848 . In 1833 , Karl called a constitutional assembly ( German : Landtag ) together and created a constitutional charter that would be the law in his lands . He founded a hospital for his subjects , and had the Ständehaus built on the modern Leopoldsplatz in Sigmaringen ( today owned by the Hohenzollerische Landesbank ) . Karl also removed the burden of serfdom and various other medieval laws . During the German Revolution of 1848 Karl abdicated in favor of his son , Karl Anton , on 27 August 1848 . Following the death of his first wife , Marie Antoinette Murat on 19 January 1847 , on 14 March 1848 , Karl married Katharina von Hohenlohe - Waldenburg - Schillingsfürst ( 1817 -- 1893 ) , daughter of Prince Karl Albrecht von Hohenlohe - Waldenburg - Schillingsfürst and widow of Count Franz Erwin von Ingelheim . He died on 11 March 1853 in Bologna while traveling to Rome .  - Hohenzollern-Sigmaringen was a small county in southwestern Germany. Its rulers belonged to the senior Swabian branch of the House of Hohenzollern. The small sovereign state with the capital city of Sigmaringen was annexed to the Kingdom of Prussia in 1850 following the abdication of its sovereign in the wake of the revolutions of 1848, then became part of the newly created Province of Hohenzollern.  - The House of Hohenzollern is a dynasty of former princes, electors, kings, and emperors of Hohenzollern, Brandenburg, Prussia, the German Empire, and Romania. The family arose in the area around the town of Hechingen in Swabia during the 11th century and took their name from Hohenzollern Castle. The first ancestor of the Hohenzollerns was mentioned in 1061. They may have derived from the Burchardinger dynasty.  - The Province of Hohenzollern or the Hohenzollern Lands was a "de facto" province of the Kingdom of Prussia. It was created in 1850 by joining the principalities of Hohenzollern-Sigmaringen and Hohenzollern-Hechingen after both formerly independently ruling Catholic princely lines of the House of Hohenzollern had handed over their sovereignty to Prussia, ruled by the Protestant Hohenzollern branch. Both used the same dynastic coat of arms as the one used by the Prussian royal family.  - Swabia (colloquially "Schwabenland" or "Ländle"; in English also archaic "Suabia" or "Svebia") is a cultural, historic and linguistic region in southwestern Germany.  The name is ultimately derived from the medieval Duchy of Swabia, one of the German stem duchies, representing the territory of Alemannia, whose inhabitants interchangeably were called "Alemanni" or "Suebi".  - 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.    After reading the paragraphs above, we are interested in knowing the entity with which 'karl' exhibits the relationship of 'country of citizenship'. Find the answer from the choices below.  Choices: - belgium  - denmark  - german empire  - germany  - lithuania  - margraviate of brandenburg  - poland  - prussia  - romania  - russia  - suebi  - württemberg
romania