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
The effective sperm count normally is : 
Select and explain. 
A. 20 million / ml, B. 30 million / ml, C. 40 million / ml, D. 50 million / ml
D: 50 million / ml
Answer: D: 50 million / ml 
Explanation: 50 million / ml