Question: "So Fresh, So Clean" further propelled the sales of "Stankonia" after the success of which American alternative hip hop duo OutKast? 
Sentence (from "Outkast discography"): 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.
Relevant evidence: No