People have done studies on sex-differences on trans people and the results is quite interesting (https://health.clevelandclinic.org/research-on-the-transgender

People have done studies on sex-differences on trans people and the results is quite interesting (https://health.clevelandclinic.org/research-on-the-transgender-brain-what-you-should-know/ https://health.clevelandclinic.org/research-on-the-transgend...). Basically, transgender brain has some sex-differences that resembles the gender that the person identifies as, and that is before hormone therapies has been applied. If they did such study on antibiotics then you would likely have to do multiple ones, including if the person have taken hormones before or after puberty.