Question: What medal did this Eritrean-born American long distance runner who was coached by Bob Larsen win during the 2004 Olympics?

Context paragraphs:
Monica Joyce: Monica Joyce (born July 16, 1958) is an English turned Irish turned American long distance runner.  She is the younger sister of Irish marathoner Regina Joyce.  Both sisters represented Ireland in the 1984 Summer Olympics, Regina in the Marathon and Monica in the 3000 meters.  Previous to the Olympics Monica had represented Ireland at the 1982 European Athletics Championships, the 1983 World Championship and the 1984 World Cross Country Championships.  She also ran in the 1985 World Cross Country Championships, finishing 12th and the IAAF World Women's Road Race Championships finishing 8th.  At home she was the Irish National Champion in the 1500 metres in 1982, 1983 and 1988 with Sonia O'Sullivan a main competitor.  Across the channel, she was the English National Champion in the 5000 metres in 1982 and 1985, beating her sister in 1982.

Frederick Lorz: Frederick "Fred" Lorz (June 5, 1884 – February 4, 1914) was an American long distance runner who won the 1905 Boston Marathon.  Lorz is also known for his "finish" in the marathon at the 1904 Summer Olympics.

Meb Keflezighi: Mebrahtom "Meb" Keflezighi ( ; Ge'ez: መብራህቶም ክፍልእዝጊ, "Mebrāhtōm Kifl'izgī"; born May 5, 1975) is an Eritrean-born American long distance runner.  He is the 2004 Olympic silver medalist in the marathon and finished in fourth place in the 2012 Summer Olympics.  He won the 2009 New York City Marathon on November 1, 2009, and the 2014 Boston Marathon on April 21, 2014, becoming the first American man to win each race since 1982 and 1983, respectively.  Keflezighi is a graduate of UCLA where he won four NCAA championships competing for the UCLA Bruins track and field team.  He came in fourth in the 2014 New York City Marathon on November 2, 2014, eighth in the 2015 Boston Marathon on April 20, 2015 and second in the 2016 U.S. Olympic Team Trials to qualify for the 2016 Summer Olympics.

Mark Conover: Mark Robert Conover (born May 28, 1960 in Contra Costa County, California) is an American long distance runner and coach.  He is most famous for his unexpected strategic victory at the 1988 United States Olympic Trials marathon, qualifying him for the 1988 Summer Olympics in Seoul, South Korea, where he was a member of the U.S. Team.  The winning 2:12:26 at the Olympic trials was his personal best.

Jared Ward: Jared Ward (born September 9, 1988) is an American long distance runner.  He qualified for the 2016 Summer Olympics when he placed third in the marathon at the 2016 U.S. Olympic Trials.  He finished sixth at the 2016 Olympics.

Max Truex: Max Edwin Truex (b. November 4, 1935 Warsaw, Indiana, d. March 24, 1991 Milton, Massachusetts) was an American long distance runner.  He was a two-time Olympian, running the 10,000 metres at the 1956 and 1960 Olympics.  He also was a two-time United States champion in the 6 mile run, the imperial equivalent and added a 3-mile championship in 1962 (though he actually finished second to New Zealander Murray Halberg).  The diminutive 5' 5" Truex was called a seemingly tireless running machine.

Norm Green (runner): Dr. Norman (Norm) Green (born June 27, 1932 in Oakland, California, United States) is an American long distance runner.  He has set numerous American and World records over his career.  He still holds the current M55 American record for the 10,000 metres.  In 1996 he was elected into the inaugural class of the USATF Masters Hall of Fame, the first long distance runner.  For more than a decade, Green was the director of the Hall of Fame.

Melody Fairchild: Melody Fairchild (born as the twin to Germaine on September 10, 1973 in Boulder, Colorado) is an American long distance runner.  She is primarily known for an exceptional high school career.  She has been called the "Best American High School distance runner of all time."  In 1991, she set the American Junior and National High School record in the indoor 3,000 meters.

Tracy Smith (long-distance runner): Tracy Evans Smith (born March 15, 1945, in Altadena, California) is a retired American long distance runner.  He represented the United States at the 1968 Olympics.  He won multiple national championships including the 6 mile run in 1966, the 10,000 meters in 1968, the 3 mile run in 1969, representing the United States Army outdoors, and the 3 mile run in 1966, 1967 and 1973 indoors.  He ran for Arcadia High School in Arcadia, California and Oregon State University.

Bob Larsen: Bob Larsen (born c. 1939) is a Hall of Fame Track and field athletics coach, known largely for coaching distance runners, though he has had success coaching across a full range of events.  Larsen is currently a coach at the Mammoth Lakes Mammoth Track Club high altitude training camp.  His most notable athlete is Mebrahtom Keflezighi, the 2004 Olympic Silver medalist in the Marathon, an accomplishment that ended a 20-year drought in United States distance running medals at the Olympic level (28 years for male athletes).  Building on that success, Keflezighi won the men's division of the 2009 New York Marathon, the first American athlete to accomplish that feat since Alberto Salazar did it 27 years before in 1982, and the 2014 Boston Marathon.  Previous to that Larsen coached the UCLA Cross Country and then Track teams between 1979 and his retirement in 1999.

Supporting paragraphs: Bob Larsen Meb Keflezighi
Answer: silver