This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infertility, Subject name: Gynaecology & Obstetrics
[{'content': 'Major contribution to the semen is from: \nSelect and explain. \nA. Testes, B. Seminal vesicles, C. Prostate, D. Bulbourethral and urethral glands', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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 from seminal vesicles. TEXTBOOK OF MEDICAL PHYSIOLOGY ,GUYTON,Pg no:888,8th edition', 'role': 'assistant'}]