This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Maternal Anatomy and Physiology, Subject name: Gynaecology & Obstetrics
Single pelvic ala is seen in 
Select and explain. 
A. Robe's pelvis, B. Naegele's pelvis, C. Osteomalacia pelvis, D. Rickets pelvis
B: Naegele's pelvis
Answer: B: Naegele's pelvis 
Explanation: Naegele's pelvis - Ala on one side is absent Robe's pelvis - Ala on both sides are absent Osteomalacic pelvis - the shape of inlet is triradiate Rachitic pelvis - shape of inlet is reniform