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: Gynaecology & Obstetrics
The major contribution to the semen from: 
Select and explain. 
A. Testes, B. Seminal vesicles, C. Prostate, D. Bulbourethral and urethral glands
B: Seminal vesicles
Answer: B: Seminal vesicles 
Explanation: Semen which is ejaculated during male sexual act is composed of fluid and sperm.

vasdeferens-10%
seminal vesicles-60%-mucoid consistency
prostate gland-30%-milky
so the bulk of semen is seminal vesicle fluid