This is from the BBC:
The family of the new 800m world champion, South African Caster Semenya, has insisted she is a woman.She has been dogged by controversy about her gender and the International Association of Athletics Federations has asked her to take a gender test.
"I know she's a woman — I raised her myself," the 18-year-old's grandmother told South Africa's Times newspaper.
This is Caster Semenya: