Context: Eurasia is the combined continental landmass of Europe and Asia. The term is a portmanteau of its constituent continents. Located primarily in the Northern and Eastern Hemispheres, it is bordered by the Atlantic Ocean to the west, the Pacific Ocean to the east, the Arctic Ocean to the north, and by Africa, the Mediterranean Sea, and the Indian Ocean to the south. The division between Europe and Asia as two different continents is a historical and cultural construct, with no clear physical separation between them; thus, in some parts of the world, Eurasia is recognized as the largest of five or six continents. In geology, Eurasia is often considered as a single rigid megablock. However, the rigidity of Eurasia is debated based on the paleomagnet data., Harold Adrian Russell `` Kim '' Philby ( 1 January 1912 -- 11 May 1988 ) was a high - ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963 . He served as both an NKVD and KGB operative . In 1963 , Philby was revealed to be a member of the spy ring now known as the Cambridge Five , the other members of which were Donald Maclean , Guy Burgess , Anthony Blunt and , possibly , John Cairncross . Of the five , Philby is believed to have been most successful in providing secret information to the Soviet Union . His activities were moderated only by Joseph Stalin 's fears that he was secretly on Britain 's side . Philby was an Officer of the Order of the British Empire ( OBE ) from 1946 to 1965 ., The KGB, an initialism for "Komitet gosudarstvennoy bezopasnosti" (translated in English as Committee for State Security), was the main security agency for the Soviet Union from 1954 until its break-up in 1991. Formed in 1954, as a direct successor of such preceding agencies as the Cheka, NKGB, and MGB, the committee was attached to the Council of Ministers. It was the chief government agency of "union-republican jurisdiction", acting as internal security, intelligence, and secret police. Similar agencies were constituted in each of the republics of the Soviet Union aside from Russia and consisted of many ministries, state committees, and state commissions., In the field of counterintelligence, a double agent (also double secret agent) is an employee of a secret intelligence service, whose primary purpose is to spy on a different target organization, but who, in fact, is a member of the target organization., Cheka (    "chrezvychaynaya komissiya", Emergency Committee) was the first of a succession of Soviet state security organizations. It was created on December 20, 1917, after a decree issued by Vladimir Lenin, and was subsequently led by Felix Dzerzhinsky, a Polish aristocrat turned communist. By late 1918, hundreds of Cheka committees had been created in various cities, at multiple levels including: oblast, guberniya ("Gubcheks"), raion, uyezd, and volost Chekas, with Raion and Volost Extraordinary Commissioners. After 1922, Cheka groups underwent a series of reorganizations, with the NKVD, into bodies whose members continued to be referred to as "Chekisty" (Chekists) into the late 1980s., A security agency is a governmental organization which conducts intelligence activities for the internal security of a nation. They are the domestic cousins of foreign intelligence agencies, and typically conduct counterintelligence to thwart other countries' foreign intelligence efforts. For example, the United States Federal Bureau of Investigation (FBI) is the internal intelligence, security and law enforcement agency, while the Central Intelligence Agency (CIA) is an external intelligence service, which deals primarily with intelligence collection overseas. A similar relationship exists in Britain between MI5 and MI6., The Soviet Union, officially the Union of Soviet Socialist Republics (USSR " ) was a socialist state in Eurasia that existed from 1922 to 1991. A union of multiple subnational republics, its government and economy were highly centralized. The Soviet Union was a one-party federation, governed by the Communist Party with Moscow as its capital., Moscow (or ) is the capital and most populous city of Russia, with 12.2 million residents within the city limits and 16.8 million within the urban area. Moscow has the status of a Russian federal city., Subject: kim philby, Relation: employer, Options: (A) capital (B) central intelligence agency (C) cheka (D) federal bureau of investigation (E) kgb (F) nkvd (G) secret intelligence service (H) the atlantic
Output: secret intelligence service