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: Anatomy
Maximum fraction of semen is contributed by: 
Select and explain. 
A. Seminal Vesicles, B. Prostate, C. Bulbourethral glands, D. All contribute equally
A: Seminal Vesicles
Answer: A: Seminal Vesicles 
Explanation: Some important points regarding spermatogenesis:

Sperms are produced in: seminiferous tubules in testes.
Sertoli cells nurture the developing sperms.
Time for spermatogenesis: 64 days (Thymidine labelling records say it is 74 days).
Normal sperm count: 20 million per ml or 40 million per ejaculate.
Infertility is considered with a sperm count of less than 15 million sperms/ml.
Fructose is the main source of energy for sperms.
Prostaglandins suppress immune response against sperms in the female reproductive tract.
Zinc serves to help to stabilize the DNA-containing chromatin in the sperm cells.
Acrosomal cap houses the various enzymes needed to penetrate the zona pellucida of the oocyte.