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': 'Persistent occipitoposterior is common in : \nSelect and explain. \nA. Android pelvis, B. Anthropoid pelvis, C. Gynaecoid pelvis, D. Platypelloid pelvis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Android pelvis', 'role': 'assistant'}]