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': 'Normal sperm count is: \nSelect and explain. \nA. 20 million per ml, B. 40 million per ejaculate, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: C \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'}]