Answer: Gender is understood as what socially differentiates people, taking into account the historical and cultural patterns attributed to men and women.
Being a social role, gender can be constructed and deconstructed, that is, it can be understood as something changeable and not limited, as defined by the biological sciences.
The operation is called Sex reassignment surgery (SRS) or Gender reassignment surgery (GRS), and it is the surgical procedure whereby an individual's sexual / genital characteristics of birth are changed to those socially associated with the gender he or she recognizes.