Title: Bulgaria
Content:  Bulgaria (България), officially the Republic of Bulgaria, is a country in Southeast Europe. It lies on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. Bulgaria covers a territory of 110994 km2, and is the sixteenth-largest country in Europe. Sofia is the nation's capital and largest city; other major cities are Plovdiv, Varna and Burgas. One of the earliest societies in the lands of modern-day Bulgaria was the Neolithic Karanovo culture, which dates back to 6,500 BC. In the 6th to 3rd century BC the region was a battleground for ancient Thracians, Persians, Celts and Macedonians; stability came when 
Title: Sofia
Content:  Sofia ( София, ) is the capital and largest city of Bulgaria. It is situated in the Sofia Valley at the foot of the Vitosha mountain in the western parts of the country. The city is built west of the Iskar river, and has many mineral springs, such as the Sofia Central Mineral Baths. It has a humid continental climate. Being in the centre of the Balkans, it is midway between the Black Sea and the Adriatic Sea, and closest to the Aegean Sea. Known as Serdica in Antiquity and Sredets in the Middle Ages, Sofia has been an area of human habitation since at 
Title: Burgas
Content:  Burgas (Бургас, ), sometimes transliterated as Bourgas, is the second largest city on the Bulgarian Black Sea Coast in the region of Northern Thrace and the fourth-largest in Bulgaria after Sofia, Plovdiv, and Varna, with a population of 202,694 inhabitants, while 277,922 live in its urban area. It is the capital of Burgas Province and an important industrial, transport, cultural and tourist centre. The city is surrounded by the Burgas Lakes and located at the westernmost point of the Black Sea, at the large Burgas Bay. The LUKOIL Neftochim Burgas is the largest oil refinery in southeastern Europe and the largest industrial enterprise. The Port of Burgas is the largest port in Bulgaria, and Burgas Airport is the second most important in the country. Burgas is the centre of the Bulgarian fishing and fish processing industry.
Title: Provinces of Bulgaria
Content:  The provinces of Bulgaria (области на България) are the first-level administrative subdivisions of the country. Since 1999, Bulgaria has been divided into 28 provinces (области – oblasti; singular: област – oblast; also translated as "regions") which correspond approximately to the 28 districts (in окръг – okrǎg, plural: окръзи – okrǎzi), that existed before 1987. The provinces are further subdivided into 265 municipalities (singular: община – obshtina, plural: общини – obshtini). Sofia – the capital city of Bulgaria and the largest settlement in the country – is the administrative centre of both Sofia Province and Sofia City Province (Sofia-grad). The capital is included (together with three other cities plus 34 villages) in Sofia Capital Municipality (over 90% of whose population lives in Sofia), which is the sole municipality comprising Sofia City province.
Title: Plovdiv
Content:  Plovdiv (Пловдив, ) is the second-largest city in Bulgaria, standing on the banks of the Maritsa river in the historical region of Thrace. It has a population of 346,893 and 675,000 in the greater metropolitan area. Plovdiv is the cultural capital of Bulgaria and was the European Capital of Culture in 2019. It is an important economic, transport, cultural, and educational center. During most of its recorded history, Plovdiv was known by the name Philippopolis after Philip II of Macedon. Plovdiv is situated in a fertile region of south-central Bulgaria on the two banks of the Maritsa River. The city has 
Title: Sofia
Content:  regional capital of Rumelia Eyalet, the Ottoman Empire's key province in Europe. Bulgarian rule was restored in 1878. Sofia was selected as the capital of the Third Bulgarian State in the next year, ushering a period of intense demographic and economic growth. Sofia is the 14th largest city in the European Union. It is surrounded by mountainsides, such as Vitosha by the southern side, Lyulin by the western side, and the Balkan Mountains by the north, which makes it the third highest European capital after Andorra la Vella and Madrid. Being Bulgaria's primate city, Sofia is home of many of the major local universities, cultural 
Title: Outline of Bulgaria
Content: Capital of Bulgaria: Sofia ; Cities and towns of Bulgaria ; Villages of Bulgaria Municipalities of Bulgaria
Title: Outline of Bulgaria
Content: Form of government: parliamentary republic ; Capital of Bulgaria: Sofia ; Elections in Bulgaria ; Political parties in Bulgaria Politics of Bulgaria
Title: List of companies of Bulgaria
Content:   Bulgaria is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and North Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. With a territory of 110994 km2, Bulgaria is Europe's 16th-largest country. Bulgaria's population of 7.4 million people is predominantly urbanised and mainly concentrated in the administrative centres of its 28 provinces. Most commercial and cultural activities are centred on the capital and largest city, Sofia. The strongest sectors of the economy are heavy industry, power engineering, and agriculture, all of which rely on local natural resources. For further information on the types of business entities in this country and their abbreviations, see "Business entities in Bulgaria".
Title: Ruse, Bulgaria
Content:  Ruse (also transliterated as Rousse, Russe; Русе ) is the fifth largest city in Bulgaria. Ruse is in the northeastern part of the country, on the right bank of the Danube, opposite the Romanian city of Giurgiu, approximately 75 km south of Bucharest, Romania's capital, 200 km from the Bulgarian Black Sea Coast and 300 km from the capital Sofia. Thanks to its location and its railway and road bridge over the Danube (Danube Bridge), it is the most significant Bulgarian river port, serving an important part of the international trade of the country. Ruse is known for its 19th- 

Question: What is the capital of Bulgaria?
Answer: Sofia.
Serdica.
Sredez.
Sofija.
Sredets.