Who won the gold medal in women's 400 m hurdles at the Rio 2016 Olympics?

400 meter dash: Marita Koch of East Germany in a time of 48.60 seconds. 400 meter freestyle: Ines Diers of East Germany in a time of 4:08.76. 400 meter individual medley: Petra Schneider of East Germany in a time of 4:36.29.