Information: - Tristan da Cunha, colloquially Tristan, is the name of both a remote group of volcanic islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world, lying from the nearest inhabited land, Saint Helena, and from the nearest continental land, South Africa. It is from South America. The territory consists of the main island, named Tristan da Cunha, which has a northsouth length of and an area of , along with the smaller, uninhabited Nightingale Islands and the wildlife reserves of Inaccessible and Gough islands. As of January 2017, the main island has 262 permanent inhabitants. Meanwhile, the other islands are uninhabited, except for the personnel of a weather station on Gough Island. - Rio de Janeiro ("River of January"), or simply Rio, is the second-most populous municipality in Brazil and the sixth-most populous in the Americas. The metropolis is anchor to the Rio de Janeiro metropolitan area, the second-most populous metropolitan area in Brazil and sixth-most populous in the Americas. Rio de Janeiro is the capital of the state of Rio de Janeiro, Brazil's third-most populous state. Part of the city has been designated as a World Heritage Site, named ""Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea"", by UNESCO on 1 July 2012 as a Cultural Landscape. - Agriculture is the cultivation and breeding of animals, plants and fungi for food, fiber, biofuel, medicinal plants and other products used to sustain and enhance human life. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the development of civilization. The study of agriculture is known as agricultural science. The history of agriculture dates back thousands of years, and its development has been driven and defined by greatly different climates, cultures, and technologies. Industrial agriculture based on large-scale monoculture farming has become the dominant agricultural methodology. - The Cunene River (Portuguese spelling) or Kunene River (Namibian spelling) is a river in Southern Africa. It flows from the Angola highlands south to the border with Namibia. It then flows west along the border until it reaches the Atlantic Ocean. It is one of the few perennial rivers in the region. It is about long, with a drainage basin in area. Its mean annual discharge is 174 m/s (6,145 cfs) at its mouth. The Epupa Falls lie on the river. Olushandja Dam dams a tributary of the river, the Etaka, and helps provide the Ruacana Power Station with water. - A population is the number of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding. - 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. - Population density (in agriculture: standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and most of the time to humans. It is a key geographical term. - Saint Helena, Ascension and Tristan da Cunha is a British Overseas Territory located in the South Atlantic and consisting of the island of Saint Helena, Ascension Island and the archipelago of Tristan da Cunha. - Saint Helena is a volcanic tropical island in the South Atlantic Ocean, east of Rio de Janeiro and west of the Cunene River, which marks the border between Namibia and Angola in southwestern Africa. It is part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha. Saint Helena measures about and has a population of 4,534 (2016 census). It was named after Saint Helena of Constantinople. - This is a list of African countries and dependencies by population density in inhabitants / km . Saint Helena , being closest to Africa , has been included . - In physics, astronomy, chemistry, biology and geography, number density (symbol: "n" or "") is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volume number density, two-dimensional area number density, or one-dimensional line number density. Population density is an example of areal number density. The term number concentration (symbol: "C", to avoid confusion with amount of substance "n") is sometimes used in chemistry for the same quantity, particularly when comparing with other concentrations. - Modern humans ("Homo sapiens", primarily ssp. "Homo sapiens sapiens") are the only extant members of Hominina tribe (or human tribe), a branch of the tribe Hominini belonging to the family of great apes. They are characterized by erect posture and bipedal locomotion; manual dexterity and increased tool use, compared to other animals; and a general trend toward larger, more complex brains and societies. - Namibia, officially the Republic of Namibia (German: ), is a country in southern Africa whose western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and east. Although it does not border Zimbabwe, a part of less than 200 metres of the Zambezi River (essentially a small bulge in Botswana to achieve a Botswana/Zambia micro-border) separates the two countries. Namibia gained independence from South Africa on 21 March 1990, following the Namibian War of Independence. Its capital and largest city is Windhoek, and it is a member state of the United Nations (UN), the Southern African Development Community (SADC), the African Union (AU), and the Commonwealth of Nations. 'list of african countries by population density' is related to which object entity through the relation of 'is a list of'? Choices: - city - country - food - human - island - line - metropolitan area - mountain - municipality - name - population - river - species - state - station - symbol - term
A:
country