Question: "The Poor Kid" is the fifteenth season finale of a series created by who ?

full_context: Document 1: The Last of the Meheecans: "The Last of the Meheecans" is the ninth episode of the fifteenth season of the American animated television series "South Park", and the 218th episode of the series overall. It first aired on Comedy Central in the United States on October 12, 2011. In the episode, what begins as an innocent game between the boys turns serious when Cartman joins the U.S. Border Patrol. Unsurprisingly, Cartman turns out to be really good at stopping Mexicans.
Document 2: Cartman's Mom Is a Dirty Slut: "Cartman's Mom Is a Dirty Slut" is the first season finale of the American animated television series "South Park". It originally aired on Comedy Central in the United States on February 25, 1998. The episode is the highest viewed episode in the entire "South Park" series, with 6.4 million views. It is part one of a two-episode story arc, which concluded with "Cartman's Mom Is Still a Dirty Slut". The episode follows Eric Cartman, one of the show's child protagonists, becoming curious about the identity of his father. He discovers that his father is most likely a man his mother had sexual intercourse with during an annual party called "The Drunken Barn Dance". Meanwhile, his friends Stan, Kyle and Kenny participate on "America's Stupidest Home Videos", after filming Cartman playing in his yard with plush toys.
Document 3: List of South Park episodes: "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.
Document 4: South Park: 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.
Document 5: A Very Crappy Christmas: "A Very Crappy Christmas" is the seventeenth and final episode of the fourth season of the animated television series "South Park", and the 65th episode overall. It first aired on Comedy Central in the United States on December 20, 2000. In the episode, Kyle awaits Mr. Hankey on Christmas, but he does not show up. To try to spread some Christmas cheer, Kyle and the boys decide to create their own animated special.
Document 6: Kenny McCormick: Kenneth "Kenny" McCormick is a main character in the animated adult television series "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Eric Cartman. His oft-muffled and indiscernible speech—the result of his parka hood covering his mouth—is provided by co-creator Matt Stone. He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").
Document 7: Kyle Broflovski: Kyle Broflovski (sometimes spelled Kyel Broflovski, Broslovski, Broslofski, Brovlofski or Broflofski) is a main character in the Comedy Central series "South Park". He is voiced by and loosely based on co-creator Matt Stone. Kyle is one of the show's four central characters, along with his friends Stan Marsh, Kenny McCormick, and Eric Cartman. He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").
Document 8: South Park (season 15): The fifteenth season of the American animated sitcom "South Park" began airing on Comedy Central on April 27, 2011 and ended on November 16, 2011. In response to reactions to the mid-season finale episode "You're Getting Old", which seemed to insinuate that creators Trey Parker and Matt Stone were wrapping up the series, Comedy Central proclaimed through the media that "South Park" was renewed for two more seasons, and the duo were signed through 2013. Shortly before the airing of the season finale episode "The Poor Kid", "South Park" was extended again until 2016, taking the show to 20 seasons. Parker was the director and writer for all episodes, and Robert Lopez was the writer in this eleventh episode for the fifteenth season.
Document 9: Eric Cartman: Eric Theodore Cartman, often referred to as just Cartman, is a main character in the animated television series "South Park", created by Matt Stone and Trey Parker, and voiced by Trey Parker. Cartman, generally referred to by his surname, is one of four central characters in "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Kenny McCormick. Cartman first appeared, originally named Kenny, in prototypical form in a 1992 animated short "Jesus vs. Frosty", and a 1995 animated short "Jesus vs. Santa", and first appeared on television in the pilot episode of "South Park", "Cartman Gets an Anal Probe", on August 13, 1997.
Document 10: South Park: Bigger, Longer &amp; Uncut: 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.
Document 11: South Park (season 1): The first season of the animated television series "South Park" ran for 13 episodes from August 13, 1997 to February 25, 1998 on the American network Comedy Central. The creators Trey Parker and Matt Stone wrote most of the season's episodes; Dan Sterling, Philip Stark and David Goodman were credited with writing five episodes. The narrative revolves around four children—Stan Marsh, Kyle Broflovski, Eric Cartman and Kenny McCormick—and their unusual experiences in the titular mountain town.
Document 12: You're Getting Old: "You're Getting Old" is the seventh episode and the mid-season finale of the fifteenth season of the American animated television series "South Park", and the 216th episode of the series overall. It first aired on Comedy Central in the United States on June 8, 2011. In the episode, Stan begins to develop a profound sense of cynicism after celebrating his tenth birthday, where he is literally seeing everything as "crap". Meanwhile, Randy latches onto a new music genre, "tween wave," in an attempt to fit in, which causes problems in his marriage with Sharon.
Document 13: Goth Kids 3: Dawn of the Posers: "Goth Kids 3: Dawn of the Posers" is the fourth episode in the seventeenth season of the American animated television series "South Park". The 241st episode of the series overall, it premiered on Comedy Central in the United States on October 23, 2013. It was originally scheduled to air October 16, but a power outage that occurred at South Park Studios prevented the episode from being finished in time, breaking a streak of 240 episodes aired consecutively without ever missing a single deadline. The episode satirizes the goth, emo and vampire teen subcultures, and uses plot elements from the film "Invasion of the Body Snatchers". The episode received a mixed critical reception.
Document 14: The Poor Kid: "The Poor Kid" is the fifteenth season finale of the American animated television series "South Park", and the 223rd episode of the series overall. It first aired on Comedy Central in the United States on November 16, 2011. In the episode, Kenny and his brother and sister are sent to a foster home after police discover a meth lab in their house. As a result, Cartman is left with feelings of loss, since he no longer has someone to ridicule for their poverty.
Document 15: South Park (season 6): Season six of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 6, 2002. The sixth season concluded after 17 episodes on December 11, 2002. This season is notable for being the only one without Kenny as a main character, as he was written off in the previous season. Kenny, however, plays a part in some episodes without appearing and returns at the conclusion of the final episode.
ground_truth: Trey Parker and Matt Stone