What causes the penis to develop?\nOptions:\n- (A) Creatine\n- (B) Energy\n- (C) Estrogen\n- (D) Testicles\n- (E) matter vibrating\n- (F) Testosterone\n- (G) movement\n- (H) It expands OK. Let's think hard:
User
Testosterone stimulates the reproductive organs to develop into male organs. Male mammals have a tube-like organ called the 'penis'. Testosterone causes the penis to develop.
So, the final answer is (F).
Assistant