Task: Question Answering
Input (English): Context: Plovdiv is the second-largest city in Bulgaria with a population of 341,567 inhabitants , while 544,628 live in its urban area. It is an important economic, transport, cultural, and educational center. Plovdiv has evidence of habitation since the 6th millennium BC when the first Neolithic settlements were established. It is said to be one of the oldest cities in the world., 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., 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., Burgas Province (- "Oblast Burgas", former name Burgas okrug) is a province in southeastern Bulgaria, including southern Bulgarian Black Sea Coast. It is bounded on the south by Turkey. The province is named after its administrative and industrial centre - the city of Burgas - the fourth biggest town in the country. It is the largest province by area, embracing a territory of 7,748.1 km² that is divided into 13 municipalities with a total population, as of December 2009, of 422,319 inhabitants., 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., Burgas, sometimes transliterated as "Bourgas", is the second largest city on the Bulgarian Black Sea Coast and the fourth-largest in Bulgaria after Sofia, Plovdiv, and Varna, with a population of 211,033 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., 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., The Bulgarian Black Sea Coast ("Chrnomori") covers the entire eastern bound of Bulgaria stretching from the Romanian Black Sea resorts in the north to European Turkey in the south, along 378 km of coastline. White and golden sandy beaches occupy approximately 130 km of the 378 km long coast. The region is an important center of tourism during the summer season (MayOctober), drawing millions of foreign and local tourists alike and constituting one of the country's most popular tourist destinations. Prior to 1989 the Bulgarian Black Sea coast was internationally known as the "Red Riviera". Since the fall of the Iron Curtain, however, its nickname has been changed to the "Bulgarian Riviera"., 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., Varna (pronounced ) is the largest city and seaside resort on the Bulgarian Black Sea Coast, with a population of 334,466 inhabitants as of 2015, while 417,867 live in its functional urban area., Sarafovo is a neighbourhood of Burgas, largest city in South Eastern Bulgaria - a regional, tourist and trade center. , 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 ., Burgas Airport ( IATA : BOJ , ICAO : LBBG ) , ( Bulgarian :   , Letishte Burgas ) is an airport in southeast Bulgaria and the second largest airport in the country . The airport is located near to the north neighbourhood of Burgas , Sarafovo almost 10 kilometres from the city centre . Between the airport and the city centre is located the Lake Atanasovsko . The airport serves Burgas and seaside resorts of Bulgarian south coast . In 2014 , the airport handled 2,522,319 passengers , a 2.0 % increase compared to 2013 ., Sofia (or or ;) ("Sofiya",) is the capital and largest city of Bulgaria. The city has a population of 1.26 million, while 1.68 million people live in its metropolitan area. The city is located at the foot of Vitosha Mountain in the western part of the country, within less than drive from the Serbian border. Its location in the centre of the Balkan peninsula means that it is the midway between the Black Sea and the Adriatic Sea, whereas the Aegean Sea is the closest to it., Subject: burgas airport, Relation: located_in_the_administrative_territorial_entity, Options: (A) albania (B) anatolia (C) balkans (D) bulgaria (E) burgas (F) burgas province (G) center (H) centre (I) eu (J) europe (K) european union (L) golden (M) greece (N) kosovo (O) montenegro (P) most (Q) mountain (R) north (S) northwest (T) of (U) plain (V) plovdiv (W) romania (X) seaside (Y) serbia (Z) sofia ([) south (\) syria (]) thessaloniki (^) turkey (_) union (`) varna
Output (English): burgas province