Question: "So Fresh, So Clean" further propelled the sales of "Stankonia" after the success of which American alternative hip hop duo OutKast? 
Context: The discography of Gnarls Barkley, an American alternative hip hop duo composed of record producer Danger Mouse and soul singer Cee Lo Green, consists of two studio albums, two extended plays, seven singles and seven music videos.  The duo originally met in the late 1990s, and began to record music together in 2003 following the release of Danger Mouse's 2003 album "Ghetto Pop Life".  Their first single, "Crazy", was released in 2006; it achieved worldwide chart success, reaching number two on the US "Billboard" Hot 100 – where it was certified double platinum by the Recording Industry Association of America (RIAA) – and reaching the top ten of the Australian, New Zealand and Swiss singles charts, among others.  It also topped the UK Singles Chart, attracting considerable attention for becoming the first song ever to top the chart on digital download sales alone, following a change to the chart's eligibility rules allowing songs to chart purely on digital sales providing that it was given a physical release the following week.  The song appeared on Gnarls Barkley's debut studio album, "St. Elsewhere", which peaked at number four on the US "Billboard" 200 as well as topping the New Zealand and United Kingdom albums charts.  Three further singles – "Smiley Faces", which reached the top ten of the UK and Irish singles charts, "Who Cares? " and a cover of the Violent Femmes song "Gone Daddy Gone" – were released from "St. Elsewhere", although none of them appeared on the "Billboard" Hot 100. The discography of American rapper Big Boi consists of three studio albums, one mixtape, twenty-two singles, five promotional singles and twenty-five music videos. Big Boi initially achieved success as a member of the hip hop duo Outkast with fellow rapper André 3000; they have recorded and released six studio albums together, and their singles "Ms. Jackson", "Hey Ya! " and "The Way You Move" have all topped the US "Billboard" Hot 100.  In 1995, Big Boi made a guest appearance on the single "Dirty South" by American hip hop group Goodie Mob, which peaked at number 92 on the "Billboard" Hot 100.  During the late 1990s and early 2000s, he made several other appearances on commercially successful singles, including "All n My Grill" by rapper Missy Elliott, "A.D.I.D.A.S." by rapper Killer Mike and "Girlfight" by singer Brooke Valentine; these songs charted on the "Billboard" Hot 100. The discography of Outkast, an American hip hop duo consisting of rappers André 3000 and Big Boi, consists of five studio albums, one compilation album, one soundtrack album, one video album, thirty-two singles (including eight as featured artists), three promotional singles and twenty-one music videos.  In 1992, Outkast became the first hip hop act to be signed to the label LaFace Records; with their first studio album "Southernplayalisticadillacmuzik" (1994) that debuted at number 20 on the US "Billboard" 200.  "Southernplayalisticadillacmuzik" spawned the commercially successful single "Player's Ball" that has reached at number 37 on the US "Billboard" Hot 100.  It was later certified gold by the Recording Industry Association of America (RIAA).  Their following two albums, "ATLiens" (1996) and "Aquemini" (1998), were commercially successful in the United States; both albums peaked at number two on the "Billboard" 200, and were certified double-platinum by the Recording Industry Association of America (RIAA).  Three singles were solicited from each album; all three from "ATLiens" charted on the "Billboard" Hot 100, with "Elevators (Me & You)" peaking at number 12, making it the most successful.  The lead single from "Aquemini", "Rosa Parks", peaked at number 55 on the "Billboard" Hot 100: two more singles, "Skew It on the Bar-B" and "Da Art of Storytellin' (Pt. 1)", were released from the album.  In 1998, Outkast collaborated with hip hop group Goodie Mob on the single "Black Ice (Sky High)" and rapper Cool Breeze on the single "Watch for the Hook"; both singles peaked at numbers 50 and 73 on the "Billboard" Hot 100, respectively. "The Way You Move" is a song recorded by Big Boi of the American hip hop duo OutKast, released by LaFace Records.  The song features OutKast mentor Sleepy Brown on guest vocals.  Along with "Hey Ya! ", recorded by OutKast's other member André 3000, "The Way You Move" is one of the two lead singles from "Speakerboxxx/The Love Below", OutKast's double album project which includes a solo album from each member. "International Player's Anthem (I Choose You)" is a song by American hip hop duo UGK, released on June 6, 2007, as the second single from their fifth studio album "Underground Kingz" (2007).  The song, produced by DJ Paul and Juicy J of Three 6 Mafia, features verses from fellow Southern hip hop duo OutKast. Sir Lucious Left Foot: The Son of Chico Dusty is the debut studio album by American rapper Big Boi, released on July 5, 2010, by Purple Ribbon Records and Def Jam Recordings.  It is his first solo album as a member of hip hop duo OutKast.  Production for the album took place primarily at Stankonia Recording Studio in Atlanta during 2007 to 2010 and was handled by several record producers, including Organized Noize, Scott Storch, Salaam Remi, Mr. DJ, and André 3000, among others. Antwan André Patton (born February 1, 1975), better known by his stage name Big Boi, is an American rapper, songwriter, actor and record producer, best known for being a member of American hip hop duo Outkast alongside André 3000.  His work in the duo has produced six studio albums.  Big Boi's solo debut "" was released in July 2010 to respectable sales and critical acclaim.  He released his sophomore studio album, "Vicious Lies and Dangerous Rumors" in 2012. " Boomiverse", his third studio album was released in June 2017. "So Fresh, So Clean" is the third and final single to be released from Outkast's fourth studio album, "Stankonia".  It features uncredited vocals from singer Sleepy Brown.  It was produced by longtime collaborators Organized Noize.  The music video features the duo and Sleepy Brown performing on a variety of CGI backgrounds, a beauty parlor, and a church.  Ludacris, Layzie Bone of Bone Thugs-N-Harmony, Chilli of TLC and members of Goodie Mob make cameo appearances in the video.  The song was a moderate success, reaching #30 on the "Billboard" charts, #46 on the ARIA charts and further propelling the sales of "Stankonia" after the success of "Ms. Jackson".  Among the things and people mentioned in the song are the Chevrolet Monte Carlo and Cadillac Eldorado (both General Motors cars), the television show "Showtime At The Apollo" and its longtime host Kiki Sheppard, and the R&B singers Teddy Pendergrass and Freddie Jackson.  It appeared on the soundtrack for the video game NBA 2K18. "Ms. Jackson" is a song by American alternative hip hop duo OutKast.  It was released on October 3, 2000, as the second single from their fourth album, "Stankonia".  It topped the US charts, and won a 2002 Grammy Award for Best Rap Performance by a Duo or Group.  It also reached number one in Germany and number two in the United Kingdom, held from the top spot by Atomic Kitten's "Whole Again".  In October 2011, "NME" placed it at number 81 on its list of the "150 Best Tracks of the Past 15 Years" and in June of the same year "Rolling Stone" ranked it at number 55 in their "100 Best Songs of the 2000s". Stankonia is the fourth studio album by American hip hop duo OutKast.  It was released on October 31, 2000, by La Face Records.  The album was recorded in the duo's recently purchased Atlanta recording facility Stankonia Studios, which allowed for fewer time and recording constraints, and featured production work from Earthtone III (a production team consisting of Outkast and Mr. DJ) and Organized Noise.
Answer: Ms. Jackson