Femininity and Masculinity: Nature or Nurture?

I'm currently reading a book concerning whether your femininity and/or masculinity is...

A. Natural (you were born girl/ boyish)

B. Nurture (you were taught to be girlie/ boyish)

C. Both (you have natural traits and were raised as such)

I personally think it is a combination of both. I was raised like i was a girlie chick, but as i got older, i realized that i was very much dudeish. But, then again, I do enjoy cute things, and a lot of boys don't.

My reasoning? Some transsexuals were not raised that way, they just are.

So, what is your opinion?