This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
Major part of semen is secreted by- 
Select and explain. 
A. Seminal vesicle, B. Cowpers glands, C. Prostate, D. Urethral gland
A: Seminal vesicle
Answer: A: Seminal vesicle 
Explanation: Ans. is 'a' i.e., Seminal vesicl * Seminal vesicle secretions contributes 60% of total volume of semen.Composition of human semenPhysical characterSeminal Vesicle secretions (contributes 60% oftotal volume)From prostate (20% of volume)Buffers* Colour : white, opalescent* Specific gravity : 1.028* Ph: 7.35 -7.50* Sperm-count: ~ 100 million/mL with fewer than 20% abnormal form* Contain hyaluronidase* Fructose (1.5-6.5 mg/ml)* Flavins* Ergothionene* Ascorbic acid* Phosphoryl choline* Prostaglandins* Spermine* Citric acid* Cholesterol* Phospholipids* Fibrinolysin* Zinc* Acid phosphatase* Phosphate* Bicarbonate