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: Physiology
Which of the following organs secretes zinc in large amount in man? 
Select and explain. 
A. Seminal vesicle, B. Prostate, C. Epididymis, D. Vas
B: Prostate
Answer: B: Prostate 
Explanation: Prostate contributes 20% of the total volume of the semen. Secretion from the prostate contains the following: Spermine Citric acid Cholesterol, phospholipids Fibrinolysin, fibrinogenase Zinc Acid phosphatase From seminal vesicles: Fructose Phosphorylcholine Ergothioneine Ascorbic acid Flavins Prostaglandins Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 23. Function of the Male Reproductive System. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e.