This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
What stimulates the gonads in the male at 8 weeks to secrete testosterone – 
Select and explain. 
A. Inhibin from corpus luteum, B. GnRH from hypothalamus of baby, C. Placental HCG, D. All of above
C: Placental HCG
Answer: C: Placental HCG 
Explanation: 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.