Question: Who wrote and directed the season of "South Park" that "Up the Down Steroid" aired in?

Context paragraphs:
Fatbeard: "Fatbeard" is the seventh episode of the thirteenth season of the American animated television series "South Park".  The 188th overall episode of the series, it originally aired on Comedy Central in the United States on April 22, 2009 and in the United Kingdom on April 24, 2009.  It was the mid-season finale, marking the final "South Park" episode for six months.  In the episode, Cartman misinterprets news reports about piracy in the Indian Ocean to mean the return of the classic era of swashbuckling pirates, and misleads a handful of South Park boys to voyage to Mogadishu to start a pirate crew.

Up the Down Steroid: "Up the Down Steroid" is the second episode in the eighth season of the American animated television series "South Park".  It originally aired on Comedy Central in the United States on March 24, 2004.  In the episode, Jimmy enters the special Olympics but starts using steroids to improve his performance.  Cartman, believing he will have an advantage over the other children, disguises himself as handicapped so he can enter and win the cash prize.  The title of the episode is a parody of the book "Up the Down Staircase".

Eat, Pray, Queef: "Eat, Pray, Queef" is the fourth episode of the thirteenth season of the American animated television series "South Park".  The 185th overall episode of the series, it originally aired on Comedy Central in the United States on April 1, 2009.  In the episode, the men and boys of South Park become infuriated when the fart-joke oriented "Terrance and Phillip" show is replaced with the "Queef Sisters", a show devoted to queef jokes.  The women and girls of South Park accuse them of holding a sexist double standard when it comes to women queefing and men farting.

South Park, Houston: South Park is a broad post-World War II development in the south-central area of Houston, Texas, a few miles south of MacGregor Park (from which it gets its name) and directly south of the 610 Loop.  According to the 2000 Census, the community has a population of 22,282.  81% of the South Park population is predominately African American, compared to 25% for the city as a whole.  Houston's Martin Luther King Boulevard runs through the area.  Reflecting its postwar origins, many streets in South Park are named after World War II battle sites and persons.  In the 1980s and 1990s crime became a key issue for South Park.  Katharine Shilcutt of the "Houston Press" said "South Park is an overgrown garden these days, its soil only able to be tilled by the most determined or the most desperate.  It shows no sign that it will grow again any time in the near future."

Ganksta N-I-P: Lewayne Williams, (born, August 28, 1969, better known as Ganxsta N.I.P. pronounced Gangsta Nip) is a rapper from South Park, Houston, Texas and a member of the South Park Coalition, which he cofounded in 1987 with Houston rapper K-Rino.  In 1992 he released his debut album "South Park Psycho".  This record also help put the South Park Coalition name on the map due to world wide distribution from Rap-a-Lot.  He also wrote the Geto Boys hit "Chuckie".  NIP stands for "Nation of Islam is Powerful" he is also a part of The Nation of Islam.  Williams is also looked at as one of the creators of the horrorcore rap genre.

South Park Let's Go Tower Defense Play!: South Park Let's Go Tower Defense Play!  is a 2009 video game based on the American animated television series "South Park", released on the Xbox Live Arcade service for the Xbox 360 video game console.  The game was developed by Doublesix in collaboration with South Park Digital Studios and Xbox Live Productions.  "Let's Go Tower Defense Play" is a tower defense game, with the added element of being a fast-paced action game as well.  Thus, players do not only build towers to eliminate destructive forces, but they also have to control multiple characters in order to successfully protect the town of South Park.  "South Park Let's Go Tower Defense Play!"  is the first "South Park" video game released after three early titles released between 1998 and 2000.

Chickenlover: "Chickenlover" is the fourth episode in the second season of the American animated television series "South Park".  The 16th episode of the series overall, it originally aired on Comedy Central in the United States on May 27, 1998.  The episode was written by series co-creators Trey Parker and Matt Stone, along with David R. Goodman, and directed by Parker.  In the episode, Officer Barbrady resigns as South Park's only police officer because of his illiteracy.  Anarchy ensues, just as chickens are mysteriously being molested across South Park.  Barbrady enlists the help of the boys to learn to read and discover who is molesting the chickens.  Cartman, meanwhile, masquerades as a police officer.

South Park School District: South Park School District is a small, suburban, public school district located in southern in Allegheny County.  It serves the residents of South Park, Pennsylvania, a suburb of Pittsburgh, Pennsylvania.  South Park School District encompasses approximately 9 mi2 square miles.  Per 2001 local census data, it serves a resident population of 14,340.  In 2009 the districts residents' per capita income was $21,538, while the median family income was $57,290.  According to District officials, in school year 2007/08 the South Park School District provided basic educational services to 2,216 pupils through the employment of 153 teachers, 78 full-time and part-time support personnel, and 14 administrators.  South Park School District received more than $9.9 million in state funding in school year 2007/08.

South Park (season 8): Season eight of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 17, 2004.  The eighth season concluded after 14 episodes on December 15, 2004, and was written and directed by Trey Parker.  The season deals with various topics that were relevant at the time of release.  The episodes portray a spectrum of topics, from effect of large scale retails corporations to immigration.

Conjoined Fetus Lady: "Conjoined Fetus Lady" is the fifth episode in the second season of the American animated television series "South Park".  The 18th episode of the series overall, it originally aired on Comedy Central in the United States on June 3, 1998.  The episode was written by series co-creators Trey Parker and Matt Stone, along with David R. Goodman, and directed by Parker.  In the episode, South Park Elementary's dodgeball team travels to China to compete for the dodgeball championship, while the town of South Park pays tribute to the school nurse, who is living with conjoined twin myslexia.

Supporting paragraphs: Up the Down Steroid South Park (season 8)
Answer: Trey Parker