What stimulates the gonads in the male at 8 weeks to secrete testosterone –: (A) Inhibin from corpus luteum, (B) GnRH from hypothalamus of baby, (C) Placental HCG, (D) All of above
Answer is C. During embryogenesis, In male embryo, at the 6-7 week of gestation, secretion of a first anti-mullerian hormone (also k/o Mullerian inhibiting substance) causes regression of Mullerian duct.
Then at 8-12 week, under influence of Placental HCG, testes started producing testosterone.