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: Gynaecology & Obstetrics
[{'content': 'WHO definition of normal sperm count : \nSelect and explain. \nA. 10 million/ml, B. 20 million/ml, C. 40 million/ml, D. 50 million/ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. 20 million/m1', 'role': 'assistant'}]