Please answer the following question: Information: - The Sukhoi Su-7 (NATO designation name: Fitter-A) was a swept wing, supersonic fighter aircraft developed by the Soviet Union in 1955. Originally, it was designed as tactical, low-level dogfighter, but was not successful in this role. On the other hand, soon-introduced Su-7B series became the main Soviet fighter-bomber and ground-attack aircraft of the 1960s. The Su-7 was rugged in its simplicity but its shortcomings included short range and low weapon load. - A variable-sweep wing, colloquially known as a "swing wing", is an airplane wing, or set of wings, that may be swept back and then returned to its original position during flight. It allows the aircraft's shape to be modified in flight, and is therefore an example of a variable-geometry aircraft. - NATO reporting names are code names for military equipment of Russia, China, and, historically, the former Eastern Bloc (Soviet Union and other nations of the Warsaw Pact). They provide unambiguous and easily understood English words in a uniform manner in place of the original designations, which either may have been unknown to the Western world at the time or easily confused codes. - The Sukhoi Su-17 (NATO reporting name: Fitter) is a Soviet variable-sweep wing fighter-bomber developed from the Sukhoi Su-7. It enjoyed a long career in Soviet, later Russian, service and was widely exported to Eastern Bloc, Arab air forces, Angola and Peru as the Su-20 and Su-22. It is the first variable-sweep wing of Russian/Soviet origin. The Su-17 set a number of world records. - The Eastern Bloc was the group of communist states of Central and Eastern Europe, generally the Soviet Union and the countries of the Warsaw Pact. The terms Communist Bloc and Soviet Bloc were also used to denote groupings of states aligned with the Soviet Union, although these terms might include states outside Central and Eastern Europe. - Peru , officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the west by the Pacific Ocean. Peru is an extremely biodiverse country with habitats ranging from the arid plains of the Pacific coastal region in the west to the peaks of the Andes mountains vertically extending from the north to the southeast of the country to the tropical Amazon Basin rainforest in the east with the Amazon river. - The Sukhoi Su - 17 ( Aircraft R ) was a prototype Soviet fighter . The name was later reused for an entirely different fighter - bomber , see Sukhoi Su - 17 . - A fighter-bomber is a fighter aircraft that has been modified, or used primarily, as a light bomber or attack aircraft. It differs from bomber and attack aircraft primarily in its origins, as a fighter that has been adapted into other roles, whereas bombers and attack aircraft are developed specifically for bombing and attack roles. - Sukhoi Company (JSC) is a major Russian aircraft manufacturer, headquartered in Begovoy District, Northern Administrative Okrug, Moscow, and designs both civilian and military aircraft. It was founded by Pavel Sukhoi in 1939 as the Sukhoi Design Bureau (OKB-51, design office prefix Su). - Angola , officially the Republic of Angola (; Kikongo, Kimbundu and Umbundu: "Repubilika ya Ngola"), is a country in Southern Africa. It is the seventh-largest country in Africa and is bordered by Namibia to the south, the Democratic Republic of the Congo to the north and east, Zambia to the east, and the Atlantic Ocean to west. The exclave province of Cabinda has borders with the Republic of the Congo and the Democratic Republic of the Congo. The capital and largest city of Angola is Luanda. After reading the paragraphs above, we are interested in knowing the entity with which 'sukhoi su-17 ' exhibits the relationship of 'subclass of'. Find the answer from the choices below. Choices: - aircraft - arab - attack aircraft - bombing - code - company - country - democratic republic of the congo - district - equipment - fighter - group - light - military aircraft - name - ocean - okrug - position - province - rainforest - range - republic - river - russian - series - time - variable - wing - world
A:
military aircraft