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': 'Classical presentation of placenta pre : \nSelect and explain. \nA. Anterior, B. Central, C. Lateral, D. Posterior', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Posterior', 'role': 'assistant'}]