Question:  "Member Berries" is the first episode in the twentieth season of the American animated television series "South Park",  an American adult animated sitcom created by which two people?
Context: "South Park" is an American animated television sitcom created by Trey Parker and Matt Stone for Comedy Central that debuted on August 13, 1997.  The series originated from a pair of animated shorts titled "The Spirit of Christmas", and the first episode of "South Park" originally aired on August 13, 1997 on Comedy Central.  Intended for mature audiences, the show has become infamous for its crude language and dark, surreal humor that lampoons a wide range of topics.  The story revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick—and their bizarre adventures in and around the eponymous Colorado town. 6 Days to Air: The Making of South Park is a 2011 television documentary film directed by Arthur Bradford that details the production process of the American adult animated sitcom "South Park".  The film follows the show's hectic, rushed six-day production schedule, in which a 22-minute episode is completed just hours before its original air date. Archer is an American adult animated spy sitcom created by Adam Reed for the FX network.  The series focuses on the life and exploits of Sterling Archer, the self-proclaimed '"world's greatest secret agent."  The first four seasons focus on him working for the fictional spy agency ISIS, under his mother, Malory.  Since then, they have become drug dealers, arms dealers, CIA agents, private investigators and most recently, post-World War II detectives with the first episode taking place in 1947.  The series premiered on September 17, 2009.  On June 21, 2016, FX renewed the series for an eighth, ninth, and tenth season, each to consist of eight episodes.  The eighth season premiered on April 5, 2017, with the series moving to sister network FXX. American Dad!  is an American adult animated sitcom created by Seth MacFarlane, Mike Barker, and Matt Weitzman for the Fox Broadcasting Company.  "American Dad!"  is the first television series to have its inception on Animation Domination.  The series premiere aired on February 6, 2005, following Super Bowl XXXIX, three months before the rest of the first season aired as part of the Animation Domination block, commencing on May 1, 2005. "Member Berries" is the first episode in the twentieth season of the American animated television series "South Park".  The 268th episode of the series overall, it premiered on Comedy Central in the United States on September 14, 2016. South Park is an American adult animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for the Comedy Central television network.  The show revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick—and their bizarre adventures in and around the titular Colorado town.  Much like "The Simpsons", "South Park" uses a very large ensemble cast of recurring characters and became infamous for its profanity and dark, surreal humor that satirizes a wide range of topics towards a mature audience. South Park: Bigger, Longer & Uncut is a 1999 American adult animated musical comedy film based on the Comedy Central animated television series "South Park".  The film was directed by series creator Trey Parker and stars the regular television cast of Parker, Matt Stone, Mary Kay Bergman, and Isaac Hayes, with guest performances by George Clooney, Eric Idle and Mike Judge.  The film follows the four boys Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick as they sneak into an R-rated film featuring Canadian actors Terrance and Phillip and begin cursing incessantly.  Eventually, their mothers pressure the United States to wage war against Canada for allegedly corrupting their children. South Park: The Fractured but Whole is an upcoming role-playing video game developed and published by Ubisoft, in collaboration with South Park Digital Studios.  The sequel to "", it is based on the American adult animated television series "South Park" and written by series creators Trey Parker and Matt Stone.  It is set to be released worldwide for Microsoft Windows, PlayStation 4, and Xbox One on October 17, 2017. South Park: The Stick of Truth is a 2014 role-playing video game developed by Obsidian Entertainment in collaboration with South Park Digital Studios and published by Ubisoft.  Based on the American adult animated television series "South Park", the game follows the New Kid, who has moved to the eponymous town and becomes involved in an epic role-play fantasy war involving humans, wizards, and elves, who are fighting for control of the all-powerful Stick of Truth.  Their game quickly escalates out of control and brings them into conflict with aliens, Nazi zombies, and gnomes, threatening the entire town with destruction. "South Park" is an American adult animated sitcom created by Trey Parker and Matt Stone who also do the majority of the voices.  Both Parker and Stone do most of the male characters on the show along with April Stewart and Mona Marshall, who do the female characters on the show.  Guest stars have lend their voices to the show including Jay Leno, George Clooney, Robert Smith and the comedy duo Cheech & Chong voiced characters representing their likenesses for the season four (2000) episode "Cherokee Hair Tampons", which was the duo's first collaborative effort in 20 years.
Answer: Trey Parker and Matt Stone