<Table> <Tr> <Th_colspan="2"> 400 metres at the Olympic Games </Th> </Tr> <Tr> <Td_colspan="2"> The 2012 Olympic men's 400 m final </Td> </Tr> <Tr> <Th_colspan="2"> Overview </Th> </Tr> <Tr> <Th> Sport </Th> <Td> Athletics </Td> </Tr> <Tr> <Th> Gender </Th> <Td> Men and women </Td> </Tr> <Tr> <Th> Years held </Th> <Td> Men: 1896--2016 Women: 1964--2016 </Td> </Tr> <Tr> <Th_colspan="2"> Olympic record </Th> </Tr> <Tr> <Th> Men </Th> <Td> 43.03 Wayde van Niekerk (2016) </Td> </Tr> <Tr> <Th> Women </Th> <Td> 48.25 Marie - José Pérec (1996) </Td> </Tr> <Tr> <Th_colspan="2"> Reigning champion </Th> </Tr> <Tr> <Th> Men </Th> <Td> Wayde van Niekerk (RSA) </Td> </Tr> <Tr> <Th> Women </Th> <Td> Shaunae Miller (BAH) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> 400 metres at the Olympic Games </Th> </Tr>

Who won the women's 400 meter dash in the olympics