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 largest presenting diameter in cephalic presentation is : 
Select and explain. 
A. Biparietal diameter, B. Suboccipito bregmatic, C. Occipito frontal, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None of the above