"Since 2004, the International Olympic Committee (IOC), whose rules are used commonly throughout competitive sport, has allowed transsexuals to compete as their reassigned gender if the surgery has taken place at least two years prior to the competition and if the athlete has been on a regimen of hormones equal to that of a person born to the gender."
Michelle Dumaresq
https://en.wikipedia.org/wiki/Michelle_Dumaresq
"Since 2004, the International Olympic Committee (IOC), whose rules are used commonly throughout competitive sport, has allowed transsexuals to compete as their reassigned gender if the surgery has taken place at least two years prior to the competition and if the athlete has been on a regimen of hormones equal to that of a person born to the gender."