Information:  - Mecklenburg (locally , Low German: "Mkel(n)borg" ) is a historical region in northern Germany comprising the western and larger part of the federal-state Mecklenburg-Vorpommern. The largest cities of the region are Rostock, Schwerin, Neubrandenburg, Wismar and Güstrow.  - A stud farm or stud in animal husbandry is an establishment for selective breeding of livestock. The word "stud" comes from the Old English "stod" meaning "herd of horses, place where horses are kept for breeding". Historically, documentation of the breedings that occur on a stud farm leads to the development of a stud book. Male animals made available for breeding to outside female animals are said to be "standing at stud", or at "stud service", referencing the relatively high probability that they are kept at a stud farm.  - Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries.  - 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.  - H.O.R.S.E. is a form of poker commonly played at the high-stakes tables of casinos. It consists of rounds of play cycling among:  - The Orlov Trotter (also known as "Orlov;" Russian:  ) is a horse breed with a hereditary fast trot, noted for its outstanding speed and stamina. It is the most famous Russian horse. The breed was developed in Russia in the late 18th century by Count Alexei Orlov at his Khrenovskoy Stud farm near the town of Bobrov (Voronezh Guberniya) . The Orlovs emerged as the result of crossing various European mares (primarily of English, Dutch, Mecklenburg, and Danish breeding) with Arabian stallions.  - The Russian Trotter is a breed of trotting horse from the Russian Federation . It originated from cross-breeding of native Orlov Trotter horses with imported American Standardbred stock from about 1890 ; by about 1950 the Russian Trotter breed was considered established , although some cross-breeding with American stallions continued . : 314 A stud - book was established in 1927 ; in 1989 it ran to 23 volumes . : 315 The Russian Trotter is widely distributed , from the Baltic to Siberia . In 1989 there were approximately 290,000 in the USSR , of which some 27,000 were considered purebred . : 315    Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'russian trotter'.  Choices: - animal  - book  - breed  - century  - concept  - continent  - farm  - federation  - horse  - horse breed  - march  - mediterranean sea  - ocean  - part  - play  - population  - region  - result  - saint  - sea  - service
Answer:
horse breed