Question: What is the bus system called in the city where the author of Pedro Páramo died?

full_context: Document 1: Mexico City: By the 1990s Mexico City had become infamous as one of the world's most polluted cities; however the city has become a model for dramatically lowering pollution levels. By 2014 carbon monoxide pollution had dropped dramatically, while levels of sulfur dioxide and nitrogen dioxide were nearly three times lower than in 1992. The levels of signature pollutants in Mexico City are similar to those of Los Angeles.[citation needed] Despite the cleanup, the metropolitan area is still the most ozone-polluted part of the country, with ozone levels 2.5 times beyond WHO-defined safe limits.
Document 2: Air pollution in Mexico City: It has been said that ``Mexico City's air has gone from among the world's cleanest to among the dirtiest in the span of a generation. ''Historic air pollution episodes of the 1950s led to acute increases in infant mortality.
Document 3: New Delhi: In an attempt to curb air pollution in New Delhi, which gets worst during the winter, a temporary alternate-day travel scheme for cars using the odd- and even-numbered license plates system was announced by Delhi government in December 2015. In addition, trucks will be allowed to enter India's capital only after 11 p.m., two hours later than the existing restriction. The driving restriction scheme is planned to be implemented as a trial from January 1, 2016 for an initial period of 15 days. The restriction will be in force between 8 a.m. and 8 p.m., and traffic will not be restricted on Sundays. Public transportation service will be increased during the restriction period.
Document 4: Bless Me, Ultima: After Quinto Sol's initial publication of "Bless Me, Ultima" in 1972, critics by and large responded enthusiastically. The general consensus was that the novel provided Chicano literature with a new and refreshing voice. Scott Wood, writing for America Press, asserted:
Document 5: The House on Mango Street: The House on Mango Street is a 1984 coming - of - age novel by Mexican - American writer Sandra Cisneros. It deals with Esperanza Cordero, a young Latina girl, and her life growing up in Chicago with Chicanos and Puerto Ricans. Esperanza is determined to ``say goodbye ''to her impoverished Latino neighborhood by turning to a life on the streets. Major themes include her quest for a better life and the importance of her promise to come back for`` the ones (she) left behind''. The novel has been critically acclaimed, and has also become a New York Times Bestseller. It has also been adapted into a stage play by Tanya Saracho.
Document 6: Juan Orol: Juan Rogelio García García, better known as Juan Orol (August 4, 1897 in Lalín, Pontevedra, Spain – May 26, 1988 in Mexico City, Mexico) was a Mexican-Spanish actor, producer, screenwriter and film director. He was known as "The King of the Mexican Film noir". He was also known as "The Involuntary Surrealist". He was a pioneer of the Mexican cinema's first talkies and one of the main promoters of the Rumberas film in the "Golden Age of Mexican cinema". His films have been described as cult films.
Document 7: Carlos Orellana: Carlos Orellana (28 December 1900 in Hidalgo – 24 January 1960 in Mexico City) was a Mexican actor, film director and screenwriter.
Document 8: Juan Son: Juan Carlos Pereda (born January 24, 1984 in Guadalajara, Mexico) is a Mexican singer and composer of experimental music. He was the vocals of the alternative rock band Porter and collaborated with Simone Pace (Blonde Redhead) as the drummer for AEIOU. He also performs solo under the pseudonym Juan Son.
Document 9: The People of Paper: The People of Paper is the debut novel of Salvador Plascencia. It was first published as a part of the Rectangulars line of McSweeney's Books. In form the novel owes a debt to a wide variety of experimental fiction from the magical realism of Latin American writers, to the Beat writings of William S. Burroughs, to the American postmodernists of the 1960s and 1970s, particularly in its turn towards metafiction. The book is notable for its unique layout, featuring columns of text running in different directions across the page, blacked out sections, and a name that has literally been cut out of the novel.
Document 10: Roberto F. Canuto: Roberto Fernandez Canuto (born April 13, 1973 in Gijon) is a Spanish film director and screenwriter. He belongs to a new generation of filmmakers from Spain with learning or working experiences internationally and with multicultural influences. "Roberto F. Canuto" is one of the first European directors to establish stable collaborations within the Chinese industry. Since 2010 he co-directs all his films with the Chinese director Xu Xiaoxi and together open a film production company in China, "Almost Red Productions".
Document 11: Juan Carlos Rulfo: Juan Carlos Rulfo Aparicio (born January 24, 1964 in Mexico City) is a Mexican screenwriter and director and the son of author Juan Rulfo. He has written, produced, and photographed several films. He is married to Valentina Leduc Navarro, a Mexican director.
Document 12: Pedro Páramo: Pedro Páramo is a novel written by Juan Rulfo about a man named Juan Preciado who travels to his recently deceased mother's hometown, Comala, to find his father, only to come across a literal ghost town─populated, that is, by spectral figures. Initially, the novel was met with cold critical reception and sold only two thousand copies during the first four years; later, however, the book became highly acclaimed. "Páramo" was a key influence on Latin American writers such as Gabriel García Márquez. "Pedro Páramo" has been translated into more than 30 different languages and the English version has sold more than a million copies in the United States.
Document 13: Nosso Lar: Nosso Lar: Life in the Spirit World (Portuguese: "Nosso Lar"), also known as "Astral City", is the best-selling novel by the Brazilian spiritist medium Francisco Cândido Xavier. First published in 1944, the book tells the story of the spirit of André Luiz, a prominent doctor who lived in the city of Rio de Janeiro. After dying, André Luiz encounters neither the Heaven nor the Hell depicted in the teachings he had received during his Catholic upbringing. Rather, he initially has to endure a period in the so-called umbral, a region where less-than-perfect souls face the consequences of their infelicitous actions while alive. After a while, André Luiz is able to perceive the presence of "Clarêncio", a friendly spirit who had been trying to help him all along during his stay in the "umbral". Clarêncio then takes André Luiz to "Nosso Lar", a spirit colony, or astral city, where André becomes acquainted with the intricacies of afterlife and reincarnation.
Document 14: Mexico City: The World Bank has sponsored a project to curb air pollution through public transport improvements and the Mexican government has started shutting down polluting factories. They have phased out diesel buses and mandated new emission controls on new cars; since 1993 all new cars must be fitted with a catalytic converter, which reduces the emissions released. Trucks must use only liquefied petroleum gas (LPG). Also construction of an underground rail system was begun in 1968 in order to help curb air pollution problems and alleviate traffic congestion. Today it has over 201 km (125 mi) of track and carries over 5 million people every day. Fees are kept low to encourage use of the system and during rush hours the crush is so great, that authorities have reserved a special carriage specifically for women. Due to these initiatives and others, the air quality in Mexico City has begun to improve, with the air becoming cleaner since 1991, when the air quality was declared to be a public health risk for 355 days of the year.[citation needed]
Document 15: Mexico City: To clean up pollution, the federal and local governments implemented numerous plans including the constant monitoring and reporting of environmental conditions, such as ozone and nitrogen oxides. When the levels of these two pollutants reached critical levels, contingency actions were implemented which included closing factories, changing school hours, and extending the A day without a car program to two days of the week. The government also instituted industrial technology improvements, a strict biannual vehicle emission inspection and the reformulation of gasoline and diesel fuels. The introduction of Metrobús bus rapid transit and the Ecobici bike-sharing were among efforts to encourage alternate, greener forms of transportation.
ground_truth: Metrobús
sub_queries: Pedro Páramo >> author Answer: Juan Rulfo
Juan Rulfo >> place of death Answer: Mexico City
What is the bus system called in Mexico City ? Answer: Metrobús