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The correct answer to this question is option 2, Ian Thorpe. He is a retired Australian swimmer who specialized in freestyle, but also competed in backstroke and individual medley. He was successful in the 9th FINA - World Swimming Championship held in Fukuoka, Japan in 2001, where he won six gold medals.
Option 1 refers to Grant Hackett, another accomplished Australian swimmer. However, Hackett did not win six gold medals at this particular event.
Option 3 mentions Michael Phelps, an American swimmer and the most decorated Olympian of all time. Despite his impressive record, Phelps didn`t win six gold medals in the 2001 World Championship.
Option 4 refers to Roman Sloudnov, a Russian swimmer known for his breaststroke events. Like Hackett and Phelps, Sloudnov also didn`t claim six gold medals in the 9th FINA - World Swimming Championship held in 2001.
So, the correct answer is Ian Thorpe who achieved this distinct feat during the Championship.