Problem: Please answer a question about the following article about List of numbered streets in Manhattan:
23rd Street is another main numbered street in Manhattan. It begins at FDR Drive and ends at Eleventh Avenue. Its length is 3.1 km/1.9m. It has two-way travel. On 23rd Street there are five local subway stations:
What is the length of 23rd Street in kilometers?
A: 3.1 km
Problem: Please answer a question about the following article about Kanye West:
808s & Heartbreak, which features extensive use of the eponymous Roland TR-808 drum machine and contains themes of love, loneliness, and heartache, was released by Island Def Jam to capitalize on Thanksgiving weekend in November 2008. Reviews were positive, though slightly more mixed than his previous efforts. Despite this, the record's singles demonstrated outstanding chart performances. Upon its release, the lead single "Love Lockdown" debuted at number three on the Billboard Hot 100 and became a "Hot Shot Debut", while follow-up single "Heartless" performed similarly and became his second consecutive "Hot Shot Debut" by debuting at number four on the Billboard Hot 100. While it was criticized prior to release, 808s & Heartbreak had a significant effect on hip-hop music, encouraging other rappers to take more creative risks with their productions.
Which album by Kanye West featured the song "Love Lockdown"?
A: 808s & Heartbreak
Problem: Please answer a question about the following article about Bras%C3%ADlia:
The metro leaves the Rodoviária (bus station) and goes south, avoiding most of the political and tourist areas. The main purpose of the metro is to serve cities, such as Samambaia, Taguatinga and Ceilândia, as well as Guará and Águas Claras. The satellite cities served are more populated in total than the Plano Piloto itself (the census of 2000 indicated that Ceilândia had 344,039 inhabitants, Taguatinga had 243,575, whereas the Plano Piloto had approximately 400,000 inhabitants), and most residents of the satellite cities depend on public transportation.
As of 2000, how many people lived in Ceilândia?
A: 344,039
Problem: Please answer a question about the following article about On the Origin of Species:
In Chapter II, Darwin specifies that the distinction between species and varieties is arbitrary, with experts disagreeing and changing their decisions when new forms were found. He concludes that "a well-marked variety may be justly called an incipient species" and that "species are only strongly marked and permanent varieties". He argues for the ubiquity of variation in nature. Historians have noted that naturalists had long been aware that the individuals of a species differed from one another, but had generally considered such variations to be limited and unimportant deviations from the archetype of each species, that archetype being a fixed ideal in the mind of God. Darwin and Wallace made variation among individuals of the same species central to understanding the natural world.
What did Darwin and Wallace make central to understanding the natural world?
A:
variation among individuals of the same species