This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'X-ray pelvimetry is indicated in all the following except \nSelect and explain. \nA. Severe CPD, B. Breech presentation in vaginal delivery, C. Outlet obstruction, D. Osteomalacia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]