It is acknowledged by peer-reviewed science that gender is partly biological and partly social construct. Ohkruhlik's Gender and the Biological Sciences goes over the history of that determination fairly well and how the biological science intersects with feminist critique. This dates back to the early 1990s. I should add that your statement "Gender is not in-born; gender is socially constructed." deals in absolutes that were prominent in the late 1970s and early 1980s, to be dismissed by the dawn of the 1990s. Too simple, you see.

So going from the accepted scientific viewpoint of both biologists and sociologists that yelena_r0ssini has correctly promoted, how is her answer not logically consistent with that accepted scientific viewpoint?

And furthermore, why should we accept your viewpoint on gender as nothing but pure social construction when it is a particularly outdated product of now-discarded second wave feminism?