Problem: Mexico City is served by the Sistema de Transporte Colectivo, a 225.9 km (140 mi) metro system, which is the largest in Latin America. The first portions were opened in 1969 and it has expanded to 12 lines with 195 stations. The metro is one of the busiest in the world transporting approximately 4.5 million people every day, surpassed only by subway lines in Moscow (7.5 million), Tokyo (5.9 million), and New York City (5.1 million). It is heavily subsidized, and has some of the lowest fares in the world, each trip costing 5.00 pesos from 05:00 am to midnight. Several stations display pre-Columbian artifacts and architecture that were discovered during the metro's construction.[citation needed] However, the metro covers less than half of the total urban area. The Metro stations are also differentiated by the use of icons and glyphs which were proposed for people who could not read. The specific icons were developed based on historical (characters, sites, pre-Hispanic motifs), linguistic, symbolic (glyphs) or location references and has being emulated in further transportations alternatives in the City and in other Mexican cities. Mexico City is the only city in the world to use the icon reference and has become a popular culture trademark for the city.
How many people ride the metro system each day?
The answer is the following: 4.5 million

The goalkeepers are the only players allowed to touch the ball with their hands or arms while it is in play and only in their penalty area. Outfield players mostly use their feet to strike or pass the ball, but may also use their head or torso to do so instead. The team that scores the most goals by the end of the match wins. If the score is level at the end of the game, either a draw is declared or the game goes into extra time and/or a penalty shootout depending on the format of the competition. The Laws of the Game were originally codified in England by The Football Association in 1863. Association football is governed internationally by the International Federation of Association Football (FIFA; French: Federation Internationale de Football Association), which organises World Cups for both men and women every four years.
Who are the only players allowed to touch the ball with their hands?
goalkeepers

Input: Spectre (2015 film)
The story sees Bond pitted against the global criminal organisation Spectre, marking the group's first appearance in an Eon Productions film since 1971's Diamonds Are Forever,[N 2] and tying Craig's series of films together with an overarching storyline. Several recurring James Bond characters, including M, Q and Eve Moneypenny return, with the new additions of Lea Seydoux as Dr. Madeleine Swann, Dave Bautista as Mr. Hinx, Andrew Scott as Max Denbigh and Monica Bellucci as Lucia Sciarra.

Which movie was Spectre originally featured in?
Output: Diamonds Are Forever

Input: Article: Though earlier approaches to translation are less commonly used today, they retain importance when dealing with their products, as when historians view ancient or medieval records to piece together events which took place in non-Western or pre-Western environments. Also, though heavily influenced by Western traditions and practiced by translators taught in Western-style educational systems, Chinese and related translation traditions retain some theories and philosophies unique to the Chinese tradition.

Now answer this question: What do historians try to piece together from pre-Western environments?

Output: events

Article: Uranium-235 was the first isotope that was found to be fissile. Other naturally occurring isotopes are fissionable, but not fissile. On bombardment with slow neutrons, its uranium-235 isotope will most of the time divide into two smaller nuclei, releasing nuclear binding energy and more neutrons. If too many of these neutrons are absorbed by other uranium-235 nuclei, a nuclear chain reaction occurs that results in a burst of heat or (in special circumstances) an explosion. In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poison, absorbing some of the free neutrons. Such neutron absorbent materials are often part of reactor control rods (see nuclear reactor physics for a description of this process of reactor control).

Question: What is used to slow a chain reaction in a nuclear reactor?
Ans: neutron poison

Input: Tucson, Arizona
Tucson's primary electrical power source is a coal and natural gas power-plant managed by Tucson Electric Power that is situated within the city limits on the south-western boundary of Davis-Monthan Air-force base adjacent to Interstate-10. The air pollution generated has raised some concerns as the Sundt operating station has been online since 1962 as is exempt from many pollution standards and controls due to its age. Solar has been gaining ground in Tucson with its ideal over 300 days of sunshine climate. Federal, state, and even local utility credits and incentives have also enticed residents to equip homes with solar systems. Davis-Monthan AFB has a 3.3 Megawatt (MW) ground-mounted solar photovoltaic (PV) array and a 2.7 MW rooftop-mounted PV array, both of which are located in the Base Housing area. The base will soon have the largest solar-generating capacity in the United States Department of Defense after awarding a contract on September 10, 2010, to SunEdison to construct a 14.5 MW PV field on the northwestern side of the base.

When did Tucson's main power plant begin operation?
Output:
1962