Conversation so far:
what event took place in London with Michael Phelps on July 28, 2012?
The morning prelims for the 400-meter individual medley
what did Michael Phelps place after the morning prelims for the 400-meter individual medley?
Phelps placed eighth
was the London 2012 morning prelims for the 400-meter individual medley a record breaking time for Phelps?
He won his heat in 4 minutes, 13.33 seconds with a time that was well off his world record of 4:03.84 set four years ago in Beijing
was the morning prelims for the 400-meter individual medley competition at the olympics?
Yes, London 2012 Summer Olympics
what other events did Michael Phelps participate in during he 2012 Olympics besides the morning prelims for the 400-meter individual medley?
The men's 4 Times 100-meter free relay

Question: who took gold in that relay?
Self-contained rewrite: who took gold in the men's 4 Times 100-meter free relay during the 2012 olympics?