Please answer the following question: Information: - Bulgaria (tr. '), officially the Republic of Bulgaria (tr. '), is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. With a territory of , Bulgaria is Europe's 16th-largest country. - The Asen dynasty ("Asenevtsi") founded and ruled a medieval Bulgarian state, called in modern historiography the Second Bulgarian Empire, between 1187 and 1256. - The House of Sratsimir , also Sracimir or Sratsimirovtsi ( Bulgarian : ) was a medieval Bulgarian dynasty that ruled the Tsardom of Tarnovo and Tsardom of Vidin , the Principality of Valona and Kanina , and the Despotate of Lovech . Paternally , they descended from the Asen dynasty , and maternally , they descended from the Shishman dynasty . Sratsimir Ivan Alexander of Bulgaria ( 1331 -- 1371 ) co-emperor Michael Asen IV of Bulgaria ( b. c. 1322 , co-emperor 1332 - 1355 ) Ivan Sratsimir of Bulgaria ( b. 1324/1325 , ruled 1356 - 1397 in Vidin ) Queen Dorothea of Bosnia Constantine II of Bulgaria ( b. early 1370s , ruled 1397 - 1422 in Vidin and in exile ) Ivan Shishman of Bulgaria ( b. 1350/1351 , ruled 1371 - 1395 in Tarnovo ) Patriarch Joseph II of Constantinople ( Patriarch of Constantinople 1416 - 1439 ) Fruzhin ( d. c. 1460 ) John Komnenos Asen ( 1332 -- 1363 ) Alexander Komnenos Asen ( 1363 -- 1372 ) Komnena ( 1372 -- 1395 ) Helena of Bulgaria ( 1332 -- 1356 ) - The Second Bulgarian Empire ("Vtor Blgarsk Tsartsvo") was a medieval Bulgarian state that existed between 1185 and 1396. A successor to the First Bulgarian Empire, it reached the peak of its power under Tsars Kaloyan and Ivan Asen II before gradually being conquered by the Ottomans in the late 14th and early 15th centuries. It was succeeded by the Principality and later Kingdom of Bulgaria in 1878. - 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 . - Vidin is a port town on the southern bank of the Danube in north-western Bulgaria. It is close to the borders with Romania and Serbia, and is also the administrative centre of Vidin Province, as well as of the Metropolitan of Vidin (since 870). - Serbia, officially the Republic of Serbia, is a sovereign state situated at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. Relative to its small territory, it is a diverse country distinguished by a "transitional" character, situated along cultural, geographic, climatic and other boundaries. Serbia is landlocked and borders Hungary to the north; Romania and Bulgaria to the east; Macedonia to the south; and Croatia, Bosnia-Herzegovina, and Montenegro to the southwest; it also claims a border with Albania through the disputed territory of Kosovo. Serbia numbers around 7 million residents, and its capital, Belgrade, ranks among the largest cities in Southeast Europe. - The Tsardom of Vidin ("Vidinsko Tsarstvo") was a medieval Bulgarian state centred in the city of Vidin. In 1257 the local lord Rostislav Mikhailovich was crowned as Tsar of Bulgaria in Tarnovo, but soon withdrew to Vidin. In 1356, Bulgarian tsar Ivan Alexander isolated Vidin from the Bulgarian monarchy and appointed his son Ivan Stratsimir (13561396) as absolute ruler of the domain of Vidin. - Turkey, officially the Republic of Turkey (Turkish: ), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a democratic, secular, unitary, parliamentary republic with a diverse cultural heritage. Turkey is bordered by eight countries: Greece to the west; Bulgaria to the northwest; Georgia to the northeast; Armenia, the Azerbaijani exclave of Nakhchivan and Iran to the east; and Iraq and Syria to the south. The Aegean Sea is to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, which together form the Turkish Straits, divide Thrace and Anatolia; they also separate Europe and Asia. Turkey's location has given it geopolitical and strategic importance throughout history. - Rostislav Mikhailovich (Bulgarian, Russian and Ukrainian: ) (after 1210 / c. 1225 1262) was a Rus' prince (a member of the Rurik dynasty), and a dignitary in the Kingdom of Hungary. - Romania is a sovereign state located in Southeastern Europe. It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova. It has an area of and a temperate-continental climate. With 19.94 million inhabitants, the country is the seventh-most-populous member state of the European Union. The capital and largest city, Bucharest, with its 1,883,425 inhabitants is the sixth-largest city in the EU. - Greece (' ), officially the Hellenic Republic (Greek: ' ), historically also known as Hellas ("" ), is a country in southeastern Europe. Greece's population is approximately 10.955 million as of 2015. Athens is the nation's capital and largest city, followed by Thessaloniki. Given the information above, choose from the list below the object entity that exhibits the relation 'country' with the subject 'sratsimir dynasty'. Choices: - albania - armenia - bulgaria - georgia - greece - iran - iraq - kingdom of hungary - kosovo - macedonia - romania - rus ' - second bulgarian empire - serbia - tsardom of vidin - turkey
A:
second bulgarian empire