Why do China's traditional ideas lead many girls to study medicine? And natural selection leads many boys to study science and engineering?

Because the traditional concept of China people thinks that girls are good-natured, able to sit still and endure grievances. So I am willing to let girls study medicine. Moreover, the medical industry is relatively stable and respected. Boys, on the other hand, are generally bold and challenging in society. I am also willing to do great things and want to achieve something. So many boys are willing to study science and engineering.