Answer
Caster Semenya won her first World Championship gold medal in 2009 in Berlin. She won the 800 meters event, and her time of 1:55.45 was a world record. This was a controversial victory, as Semenya was born with a condition that causes her to have high levels of testosterone. Some people believe that this gives her an unfair advantage in running, but Semenya has never tested positive for doping.