Given the question: What type of details about christiane knacke can be gathered from the following bio? Bio: 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 .
The answer is:
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