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Olympics Day 8 - Swimming

Gold medallist Michael Phelps of the United States kisses his medal following the medal ceremony for the Men's 4x100m medley Relay Final on Day 8 of the London 2012 Olympic Games at the Aquatics Centre on August 4, 2012 in London, England. (Photo by Al Bello/Getty Images)

Olympics Quiz: 12 questions from the '12 Games

As the 2012 London Games come to an end, we thought some expert Olympic fans might want to test their knowledge with a little quiz. -- By Chris Wilson, Yahoo! Sports