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Caster Semenya was born on 7 January 1991 in Ga-Masehlong, South Africa. She is a South African middle-distance runner who specializes in the 800 metres. She is the 2012 Olympic champion in the 800 metres and the 2016 Olympic silver medalist in the 800 metres. She is also the 2017 and 2019 world champion in the 800 metres.