Problem: Please answer a question about the following article about Railway electrification system:
DC systems (especially third-rail systems) are limited to relatively low voltages and this can limit the size and speed of trains and cannot use low-level platform and also limit the amount of air-conditioning that the trains can provide. This may be a factor favouring overhead wires and high-voltage AC, even for urban usage. In practice, the top speed of trains on third-rail systems is limited to 100 mph (160 km/h) because above that speed reliable contact between the shoe and the rail cannot be maintained.
Can DC systems use low-level platform?
A: cannot
Problem: Please answer a question about the following article about Buckingham Palace:
Between 1847 and 1850, when Blore was building the new east wing, the Brighton Pavilion was once again plundered of its fittings. As a result, many of the rooms in the new wing have a distinctly oriental atmosphere. The red and blue Chinese Luncheon Room is made up from parts of the Brighton Banqueting and Music Rooms with a large oriental chimney piece sculpted by Richard Westmacott. The Yellow Drawing Room has wallpaper supplied in 1817 for the Brighton Saloon, and a chimney piece which is a European vision of how the Chinese chimney piece may appear. It has nodding mandarins in niches and fearsome winged dragons, designed by Robert Jones.
Who designed the chimney piece in The Yellow Drawing Room?
A: Robert Jones
Problem: Please answer a question about the following article about Northwestern University:
In Fall 2008, Northwestern opened a campus in Education City, Doha, Qatar, joining five other American universities: Carnegie Mellon University, Cornell University, Georgetown University, Texas A&M University, and Virginia Commonwealth University. Through the Medill School of Journalism and School of Communication, NU-Q offers bachelor's degrees in journalism and communication respectively. The Qatar Foundation for Education, Science and Community Development provided funding for construction and administrative costs as well as support to hire 50 to 60 faculty and staff, some of whom rotate between the Evanston and Qatar campuses. In February 2016, Northwestern reached an agreement with the Qatar Foundation to extend the operations of the NU-Q branch for an additional decade, through the 2027-2028 academic year.
How long is the NU-Q branch of Northwestern scheduled to operate through an agreement in 2016?
A: through the 2027-2028 academic year
Problem: Please answer a question about the following article about Queen (band):
The group's second LP, Queen II, was released in 1974, and features rock photographer Mick Rock's iconic image of the band on the cover. This image would be used as the basis for the 1975 "Bohemian Rhapsody" music video production. The album reached number five on the British album chart and became the first Queen album to chart in the UK. The Freddie Mercury-written lead single "Seven Seas of Rhye" reached number ten in the UK, giving the band their first hit. The album is the first real testament to the band's distinctive layered sound, and features long complex instrumental passages, fantasy-themed lyrics, and musical virtuosity. Aside from its only single, the album also included the song "The March of the Black Queen", a six-minute epic which lacks a chorus. The Daily Vault described the number as "menacing". Critical reaction was mixed; the Winnipeg Free Press, while praising the band's debut album, described Queen II as a "over-produced monstrosity". Allmusic has described the album as a favourite among the band's hardcore fans, and it is the first of three Queen albums to feature in the book 1001 Albums You Must Hear Before You Die.
How long is the song The March of the Black Queen?
A:
six-minute