Question: What was the nationality of the rock band that provided the namesake for a style of music leading to hardcore punk genre D-beat?
Context: D-beat (also known as "discore", "kängpunk" (Swedish for "boot-punk"), and "discrust") is a style of hardcore punk, developed in the early 1980s by imitators of Discharge, after whom the genre is named, as well as a drum beat characteristic of this subgenre.  D-beat is known for its "grinding, distorted and brutally political" sound.  Discharge may have themselves inherited the beat from Motörhead and the Buzzcocks.  D-beat is closely associated with crust punk, which is a heavier, more complex variation.  The style was particularly popular in Sweden, and developed there by groups such as Crude SS, Anti Cimex, Mob 47 and Driller Killer.  Other D-beat groups include Doom and the Varukers from the UK; Disclose from Japan; Crucifix and Final Conflict from the U.S.; Ratos de Porão, from Brazil; and MG15, from Spain.  While the style initially developed in the early 1980s, a number of new groups working within the subgenre emerged in the mid-1990s.  These include the Swedish groups Wolfbrigade, Totalitär, Avskum, Skitsystem and Disfear. Discharge are a British rock band formed in 1977 by Terence "Tezz" Roberts and Royston "Rainy" Wainwright.  While the band had substantial line-up changes over its history, the classic line-up from the early 1980s featured bassist Wainwright, drummer Gary Maloney, Anthony "Bones" Roberts playing guitar, and vocalist Kelvin "Cal" Morris. Chaos UK are an English punk rock band formed in 1979 in Portishead, near Bristol.  They emerged as part of the anarcho-punk scene, developing a fast and aggressive hardcore punk style.  The original line up of Simon Greenham on vocals, Andy on guitar, Chaos (aka "Lice") on bass and Potts on drums recorded two EP's and a full LP for Riot City Records.  In the process they along with fellow Bristolians Disorder and Stoke's Discharge revolutionised the hardcore punk scene.  In particular the Japanese 80's hardcore punk bands were heavily influenced by Chaos UK and Disorder's brutal take on punk.  Chaos UK's debut LP was notable in the fact that the band's label claimed it was the "fastest, noisiest LP in the cosmos" in the short lived "Punk Lives" magazine; vocal duties on this recording were also handled by bassist Chaos. Anti Cimex were a Swedish hardcore punk band, based in Skövde, Gothenburg, Linköping, and Malmö, at different times, that formed in 1981.  They were one of the first bands to define Scandinavian hardcore punk.  Their second 7", "Raped Ass", is considered to be a subgenre-defining D-beat record.  Scene historian Peter Jandreus describes the group as the most famous Swedish punk band of the 1977–87 era. ACxDC (also known as Antichrist Demoncore) was an American hardcore punk band that formed in Los Angeles, California in 2003.  The band has gone through multiple line-up changes and its current line-up consists of vocalist Sergio Amalfitano, guitarists Brian Amalfitano and Aldo Felix, bassist Ryan Corbett and Jorge Luis Herrera.  The band's musical style has been mainly labeled as powerviolence, as well as grindcore and hardcore punk with influences from d-beat, crust punk and death metal.  The band's aesthetic has been described as "a strange blend of veganism, straight-edge and Satanism." Totalitär is a Swedish hardcore punk band formed in 1984-1985 in Hudiksvall.  The band plays in the style of D-beat and hardcore punk. Friendville is the second album by YouTube comedian Jarrod Alonge, released under the moniker of his fictitious pop punk band Sunrise Skater Kids, on April 1, 2016.  The album primarily satirizes and parodies the tropes and characteristics of the pop punk genre, but also shifts focus to the melodic hardcore and metalcore genres.  Direct parodies of specific bands within the pop punk genre such as Blink-182, NOFX, Mayday Parade, Neck Deep and Knuckle Puck are also included. Driller Killer is a Swedish punk rock band, strongly influenced by the sound of Discharge.  They were formed in 1993 in Malmö and are named after the Abel Ferrara movie of the same name.  They are signed to the French record label Osmose Productions and have released seven full-length albums, and a variety of split releases to date.  Their style has been described as hardcore punk, crust punk and D-beat. Born Dead Icons was a Canadian hardcore punk band from Montreal, Quebec, Canada.  They played melodic, heavy and dark d-beat hardcore punk with various influences, mainly British bands Amebix, Discharge, Zounds, and Motörhead.  They are notable for playing slower and singing more clearly than most bands in this genre.  Members also play in the band Complications.  The band played their last show in November 2007. Canadian hardcore punk originated in the early 1980s.  It was harder, faster, and heavier than the Canadian punk rock that preceded it.  Hardcore punk (usually referred to simply as hardcore) is a punk rock music genre and subculture that originated in the late 1970s.  The origin of the term "hardcore punk" is uncertain.  The Vancouver-based band D.O.A. may have helped to popularize the term with the title of their 1981 album, "Hardcore '81".  Hardcore historian Steven Blush said that the term "hardcore" is also a reference to the sense of being "fed up" with the existing punk and new wave music.  Blush also states that the term refers to "an extreme: the absolute most Punk."  One definition of the genre is "a form of exceptionally harsh punk rock."
Answer: British