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: Surgery
[{'content': 'The anatomical landmark used during posterior superior alveolar nerve block are mucobuccal fold, occlusal plane, coronoid process and anterior border of: \nSelect and explain. \nA. Ramus, B. Mandible, C. Premolar, D. Midline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]