Caster was confirmed to have a Y, and has no womb, no ovaries, has internal testes.
OK, so the biological definition of sex is met. Y chromosome defines the mammalian male. End of discussion. Unbelievable that a Y chromosome is floating around the track as part of the "women's final". Next thing you know men who "feel" like they should have been born women will be granted entry into women's athletic events. A Y chromosome is a bigger advantage in women's running events than any synthetic drug.