Interesting article: https://www.letsrun.com/news/2019/05/what-no-one-is-telling-you-about-caster-semenya-she-has-xy-chromosomes/
Excerpt: The crazy thing about the Semenya case is that even though intersex births like Semenya’s are extremely rare it’s believed that all three of the medallists in the 2016 Olympic women’s 800 – Caster Semenya, Francine Niyonsaba and Margaret Wambui — are intersex. Yes, all three. If that doesn’t make you understand from a simple odds perspective that there needs to be a limit on testosterone in women’s sports, then I don’t know what will. Of course, common sense also tells us that most human beings that have XY chromosomes gain a huge advantage in sports once they hit puberty, mainly due to increased testosterone levels.