When the US swimmer Michael Phelps became the youngest person at the time to break a world record, what was the occasion?
200 m butterfly in the World Championship Trials for the 2001 World Aquatics Championships
200 m butterfly in world championship trials for 2001 world aquatics championships
200 m butterfly in world championship trials for 2001 world aquatics championships
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200 m butterfly in the World Championship Trials for the 2001 World Aquatics Championships