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
Which of the following statements can be regarded as primary action of inhibin? 
Select and explain. 
A. It inhibits secretion of prolactin, B. It stimulates synthesis of estradiol, C. It stimulates secretion of TSH, D. It inhibits secretion of FSH
D: It inhibits secretion of FSH
Answer: D: It inhibits secretion of FSH 
Explanation: Follicle-stimulating hormone (FSH) one of the gonadotropins of the anterior pituitary, which stimulates the growth and maturity of graafian follicles in the ovary, and stimulates spermatogenesis in the male.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-333