This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Negative feedback in spermatogenesis is by 
Select and explain. 
A. ABP, B. Inhibin, C. Progesterone, D. None
B: Inhibin
Answer: B: Inhibin 
Explanation: Inhibin is One of several proteins that paicipate in differentiation and growth. Two glycoproteins, inhibin A and inhibin B, are secreted by Seoli cells in the testis and granulosa cells in the ovary, inhibiting FSH secretion by direct action on the pituitary.Ref: Ganong&;s review of medical physiology;24th edition; page no:-427