Please answer the following question: Information:  - The Lima Metro, is a metropolitan railway operated by Argentine company Ferrovías and Peruvian company Graña y Montero, currently linking the district of Villa El Salvador in the south of Lima with San Juan de Lurigancho in the east of the capital of Peru.  - Mexico City, officially City of Mexico (, ; abbreviated as "CDMX"), is the capital and most populous city of the United Mexican States. As an "alpha" global city, Mexico City is one of the most important financial centers in the Americas. It is located in the Valley of Mexico ("Valle de México"), a large valley in the high plateaus at the center of Mexico, at an altitude of . The city consists of sixteen municipalities (previously called boroughs).  - 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.  - São Paulo ("Saint Paul" in English) is a municipality located in the southeast region of Brazil. The metropolis is an alpha global cityas listed by the GaWCand is the most populous city in Brazil, the Americas, and in the Southern Hemisphere. The municipality is also Earth's 12th largest city proper by population. The city is the capital of the homonymous state of São Paulo, Brazil's most populous and wealthiest state. It exerts strong international influence in commerce, finance, arts and entertainment. The name of the city honors Saint Paul of Tarsus. The city's metropolitan area of Greater São Paulo ranks as the most populous in Brazil, the 11th most populous on Earth, and largest Portuguese-speaking city in the world.  - The Americas, also collectively called America, encompass the totality of the continents of North America and South America. Together they make up most of Earth's western hemisphere and comprise the "New World".   - The Walls of Lima were a fortification consisting mainly of walls and bastions whose purpose was to defend the city of Lima from attacks from outside . It was built between 1684 and 1687 during the government of viceroy Melchor de Navarra y Rocafull ( Duke of the Palata ) . The wall was located in the stroke of the current avenues Alfonso Ugarte , Paseo Colón , Grau and the left bank of Rímac River . During the municipal management of Luis Castaneda Lossio it recovered a section of the remains of the left bank of the Rímac River and are now visible part of the group known as `` Parque de la Muralla '' , although these are probably of a Previous construction known as `` Tajamar de San Francisco '' . The bastion Santa Lucía is a sector of the wall located on the edge of Barrios Altos and El Agustino that still stands .  - The Lima Metropolitan Area (also known as "Lima Metropolitana"), is an area formed by the conurbation of the Peruvian cities of Lima (the nation's capital) and Callao. It is the largest of the metropolitan areas of Peru, the seventh largest in the Americas, the fourth largest in Latin America, and among the thirty largest in the world. The conurbation process started to be evident in the 1980s. The metropolitan area is composed of six subregions. These are the Lima Norte, Lima Sur, Lima Este, Residential Lima, Central Lima, and Callao. Its estimated 2015 population is 9,752,000 according to INEI statistics.  - Lima (Spanish: , Quechua: , Aymara: ) is the capital and the largest city of Peru. It is located in the valleys of the Chillón, Rímac and Lurín rivers, in the central coastal part of the country, overlooking the Pacific Ocean. Together with the seaport of Callao, it forms a contiguous urban area known as the Lima Metropolitan Area. With a population of almost 10 million, Lima is the most populous metropolitan area of Peru and the second-largest city in the Americas (as defined by "city proper"), behind São Paulo and before Mexico City.  - El Callao (or ) is the chief seaport of Peru. The city is also called Provincia Constitucional (Constitutional Province), the only province of the Callao Region. The Historic Centre of Callao is located west of Historic Centre of Lima, the country's capital, and is part of the Lima Metropolitan Area. Callao borders Lima Province on the north, east and south, and the Pacific Ocean on the west.    What object entity has the relation of 'country' with the subject 'walls of lima'?   Choices: - bolivia  - brazil  - chile  - ecuador  - el salvador  - mexico  - peru  - world
Answer:
peru