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
[{'content': 'Largest diameter of pelvic cavity: March 2013 \nSelect and explain. \nA. Anteroposterior, B. Oblique, C. Transverse, D. All are same', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. All are same Maternal pelvis MC type: Gynaecoid Platypelloid/ flat pelvis: Transverse diameter is more than AP diameter Least common type of pelvis: Platypelloid Deep transverse arrest/ persistent occipito posterior position is common in: Android pelvis AP diameter more than transverse diameter: Anthropoid pelvis Face to pubis delivery is common in: Anthropoid pelvis Shoest diameter of pelvic inlet: Obstetric conjugate', 'role': 'assistant'}]