Task: Question Answering
Input (English): Context: Lake Kremasta ( Greek :   ) is the largest artificial lake in Greece . The construction of Kremasta Dam was completed in 1965 concentrating waters from four rivers : Acheloos , Agrafiotis , Tavropos and Trikeriotis . The water that is accumulated in the artificial lake is about 3.8 cubic kilometres ( 3,100,000 acre, The Agrafiotis is a river in Evrytania, Greece. The river takes its name from Agrafa, the mountainous region where it flows. The river begins near the village Trovato in the north of Evrytania. It flows south through a valley with forests and small farmlands. It is crossed by a few stone bridges. Near the village Tripotamo, the river empties into Kremasta Reservoir, built in 1969, which is drained by the river Acheloos. The Kremasta Reservoir is the largest in Greece., 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., Athens ("Athína" ) is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence starting somewhere between the 11th and 7th millennia BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus, which had been a distinct city prior to its 5th century BC incorporation with Athens. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent, and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study., 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., The euro (sign: €; code: EUR) is the official currency of the eurozone, which consists of 19 of the member states of the European Union: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. The currency is also officially used by the institutions of the European Union and four other European countries, as well as unilaterally by two others, and is consequently used daily by some 337 million Europeans . Outside of Europe, a number of overseas territories of EU members also use the euro as their currency., Evrytania (alternative romanization "Evritania", Latin: "Eurytania") is one of the regional units of Greece. It is part of the region of Central Greece. Its capital is Karpenisi (approx. 8,000 inhabitants). , Agrafa is a mountainous region in Evrytania and Karditsa regional units in mainland Greece, consisting mainly of small villages. It is the southernmost part of the Pindus range. There is also a municipality with the same name, the Municipality of Agrafa, but it covers only a small percentage of the area., Thessaloniki is the second-largest city in Greece and the capital of Greek Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace. Its nickname is   ("Symprotévousa"), literally "the co-capital", a reference to its historical status as the  ("Symvasilévousa") or "co-reigning" city of the Eastern Roman (Byzantine) Empire, alongside Constantinople., Subject: kremasta , Relation: located_in_the_administrative_territorial_entity, Options: (A) athens (B) atlantic ocean (C) austria (D) central greece (E) centre (F) constantinople (G) cyprus (H) decentralized administration of macedonia and thrace (I) east (J) estonia (K) eu (L) europe (M) european union (N) germany (O) greece (P) latvia (Q) luxembourg (R) macedonia (S) mainland (T) north (U) of (V) river (W) south (X) the nation (Y) thessaloniki (Z) union ([) west
Output (English): central greece