Answer:
androgen; males
Explanation:
Androgen is any natural or synthetic hormone which increases the male characteristics in a body. In humans the androgen is testosterone.
Testosterone is an anabolic steriod and the main male sex hormone. It has an important role in the development of the testes and prostate.
In the fetus of male brain aromatization of testosterone to estrogen occurs. This enters the male brain after crossing the blood–brain barrier.
In the fetus of the female brain α-fetoprotein is present which causes the estrogen to bind and does not affect the main brain.
