Caster Semenya, 26, is a middle-distance runner and 2016 Olympic gold medallist. Caster Semenya testosterone levels is three times higher than is expected in women due to hyperandrogenism (increase testosterone). Due to a chromosomal abnormality, Caster has no womb or ovaries, but internal testes instead. IAAF will reconsider Caster Semenya eligibility to compete as a female at the end of the year.
https://www.thesun.co.uk/news/2568578/who-is-caster-semenya-gender-row-runner-and-olympic-gold-medalist-heres-what-we-know/ reported, “After winning gold in the 2009 World Championships by beating her best by four seconds, Semenya was subjected to gender testing. She was banned from international competitions for almost a year before being cleared by the International Association of Athletics Federations. The IAAF believe that all other hyperandrogenic athletes should not compete unless they try to curb their naturally high testosterone levels. But it has faced legal challenges from female athletes who claim their high testosterone levels are “entirely natural” and that the IAAF rule was “discriminatory against women”.