Margaret Nyairera Wambui

South Africa's Caster Semenya silver medalist celebrates after the women's 800m final at the athletics event of the London 2012 Olympic Games on August 11, 2012
Result: South Africa's Caster Semenya powers to Olympic women's 800m gold
South Africa's Caster Semenya wins Olympic gold in the women's 800m at Rio, but Great Britain's Lynsey Sharp misses out on a medal after finishing sixth.
Aug 21, 09:21