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: Social & Preventive Medicine
[{'content': 'WHO guidelines for minimal sperm count is: September 2007 \nSelect and explain. \nA. 10 million/ ml, B. 20 million/ml, C. 50 million/ ml, D. 60 million/ ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: 20 million/ml According to WHO guidelines, minimum sperm values of normal sperm are Volume: 2 ml Concentration:20 million/ ml Motility: 50% Normal morphology: 30%', 'role': 'assistant'}]