Question: Which Iowa State University wrestling coach beat Elmadi Zhabrailov at the Olympics?

Context paragraphs:
Harold Nichols: Harold Nichols (March 22, 1917 – February 22, 1997) was a collegiate wrestler and wrestling coach.  He won the 1939 NCAA individual championship and went on to coach college wrestling for 37 years.  He built the Iowa State Cyclones into a national wrestling power.  In 32 years at Iowa State, Nichols' wrestlers won six NCAA team championships and 38 NCAA individual championships.

Iowa State Cyclones wrestling: The Iowa State Cyclones wrestling team represents Iowa State University (ISU) and competes in the Big 12 Conference of NCAA Division I.  The team is coached by Kevin Dresser.  The Cyclones host their home meets at Hilton Coliseum on Iowa State's campus.  Iowa State became the first collegiate wrestling program to reach 1000 dual wins on February 7, 2010.

Charles Mayser: Charles William Mayser (June 3, 1876 – July 14, 1967) was an American football, baseball, and wrestling coach.  He served three stints as the head football coach at Franklin & Marshall College (1913–1914, 1924–1925, 1944–1945) and was the head football coach at Iowa State University from 1915 to 1919, compiling a career college football record of 46–32–5.  Mayser was the head wrestling coach at Iowa State from 1916 to 1923 and at Franklin & Marshall from 1924 to 1946.  He was also the head baseball coach at Iowa State for two seasons, from 1919 to 1920, tallying a mark of 18–8–1.

Elmadi Zhabrailov: Elmadi Zaynaydiyevich Zhabrailov (Russian: Эльмади Зайнайдиевич Жабраилов ; born 6 September 1965) is a freestyle wrestler of Chechen origin, who competed for the Soviet Union and then Kazakhstan.  His elder brother Lukman prepared him for the 1992 Olympics, where Elmadi won a silver medal, losing the final bout to Kevin Jackson via a controversial decision.  At the next Olympics the brothers competed against each other, and Elmadi won, but placed only sixth overall.

Jim Zalesky: Jim Zalesky is an American college wrestling coach and is currently the head wrestling coach for the Oregon State Beavers and a member of the National Wrestling Hall of Fame.  Prior to joining the Beavers, he was the coach of the University of Iowa wrestling team from 1998–2006.  At Iowa, he succeeded Dan Gable as head coach, under whom he was a three-time NCAA champion.  He guided the Hawkeyes to NCAA team championships in 1998, 1999, and 2000.

Kevin Jackson: Kevin Andre Jackson (born November 25, 1964 in Highland Falls, New York) is an American Olympic gold medalist wrestler and former professional mixed martial arts competitor.  After retiring from active competition he became the head wrestling coach at Iowa State University, having been hired in 2009 after Cael Sanderson moved to Penn State University.  Before joining Iowa State, Jackson was a four-time All-American, first for Louisiana State University and then for Iowa State, where he was the NCAA runner-up in 1987.  He stepped down from his position in 2017.

Zeke Jones: Larry Lee "Zeke" Jones (born December 2, 1966) is an American wrestler who won a silver medal at the 1992 Summer Olympics in Barcelona, a world championship in Varna, Bulgaria, in 1991, and was the former freestyle head coach at USA Wrestling.  He is currently the head coach of the Arizona State University Wrestling team as of April, 2014.  He was a six-time national freestyle champion, four-time World Cup champion, Pan American Games champion, and received the "World's Most Technical Wrestler Award" awarded by FILA, the international governing body for the sport.  In college, he was a three-time All-American for Arizona State University and competed on the 1988 NCAA Championship team, coached by famed Bobby Douglas.  After college, he wrestled on two world championships teams with the United States wrestling team.  In 2005, he was inducted into the National Wrestling Hall of Fame.

Cael Sanderson: Cael Norman Sanderson ( ; born June 20, 1979) is an American college wrestling icon who rose to prominence while at Iowa State University.  He is currently the head wrestling coach of Penn State University.  He is considered one of the best American amateur wrestlers in recent history.  A 2004 Olympic champion in Athens, Greece, he went undefeated in four years of college wrestling at Iowa State University (159–0), winning four consecutive NCAA titles (1999–2002).  He is the only wrestler in NCAA Division I history to go undefeated in official matches with more than 100 wins. " Sports Illustrated" named his college career as the second most impressive college sports feat behind the setting of four world records by Jesse Owens in a single hour at the 1935 Big Ten track and field conference championship meet.

Bill Koll: Bill Koll (1923–2003) was an American wrestler at Iowa State Teachers College (now the University of Northern Iowa) and wrestling coach, most notably at his alma mater and for the Penn State Nittany Lions wrestling team.  As a wrestler Koll was undefeated (72-0) and won three straight NCAA championships (1946–1948), He was twice voted outstanding wrestler at the national tournament, the first wrestler to achieve this honor.  Koll competed for the U.S. at the 1948 Summer Olympics in London and place fifth in the freestyle competition.  As a professor of Health and Physical Education and coach, Koll led Penn State for 14 seasons (1965–1979), which included unbeaten dual meet campaigns in 1967, '70, '71, '72 and '74.

Iowa State University: Iowa State University of Science and Technology, generally referred to as Iowa State, is a public flagship land-grant and space-grant research university located in Ames, Iowa, United States.  It is the largest university in the state of Iowa and the 3rd largest university in the Big 12 athletic conference.  Iowa State is classified as a Research University with very high research activity (RU/VH) by the Carnegie Foundation for the Advancement of Teaching.  Iowa State is also a member of the Association of American Universities (AAU), which consists of 62 leading research universities in North America.  Iowa State has also been designated an "Innovation and Economic Prosperity University," a designation awarded to only 54 public universities in the U.S.

Supporting paragraphs: Elmadi Zhabrailov Kevin Jackson
Answer: Kevin Jackson