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
Naegele's pelvis is : 
Select and explain. 
A. Triradiate pelvis, B. One ala absent, C. Two alae absent, D. None
B: One ala absent
Answer: B: One ala absent 
Explanation: One ala absent