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
According to WHO criteria, the minimum normal sperm count is: 
Select and explain. 
A. 10 million/ml, B. 20 million/ml, C. 40 million/ml, D. 60 million/ml
B: 20 million/ml
Answer: B: 20 million/ml 
Explanation: None