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
[{'content': 'Maximum fraction of semen is contributed by: \nSelect and explain. \nA. Seminal Vesicles, B. Prostate, C. Bulbourethral glands, D. All contribute equally', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Some important points regarding spermatogenesis:\n\nSperms are produced in: seminiferous tubules in testes.\nSertoli cells nurture the developing sperms.\nTime for spermatogenesis: 64 days (Thymidine labelling records say it is 74 days).\nNormal sperm count: 20 million per ml or 40 million per ejaculate.\nInfertility is considered with a sperm count of less than 15 million sperms/ml.\nFructose is the main source of energy for sperms.\nProstaglandins suppress immune response against sperms in the female reproductive tract.\nZinc serves to help to stabilize the DNA-containing chromatin in the sperm cells.\nAcrosomal cap houses the various enzymes needed to penetrate the zona pellucida of the oocyte.', 'role': 'assistant'}]