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
Male infeility occurs if the sperm count is less than : 
Select and explain. 
A. 100 mill / ml, B. 75 mill / ml, C. 50 mill / ml, D. 20 mill / ml
D: 20 mill / ml
Answer: D: 20 mill / ml 
Explanation: 20 mill / ml