Q:Facts: - sport: swimming - height: 1.64 m ftin on - caption: christiane knacke in 1978 - club: sc dynamo berlin - medaltemplates: women 's swimming - birth date: 17 april 1962 - weight: 60 kg lb on - image: christiane knacke 1978.jpg - birth place: berlin , germany Based on these bullet points, write a short biography describing the life of christiane knacke .
A:
christiane knacke -lrb- born 17 april 1962 -rrb- is a retired swimmer from east germany who specialized in the 100 m butterfly .in this event she won a silver medal at the 1977 european aquatics championships and a bronze medal at the 1980 summer olympics .she was the first woman to break the one-minute barrier in the event , when she clocked 59.78 on august 28 , 1977 , setting a new world record .in 1989 she admitted to using performance enhancing drugs against her will .she married twice , changing her last name to driesener and then to sommer .her daughter jennifer , was born in 1983 .