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: Dental
[{'content': 'The highest point of the concavity behind the occipital condyles \nSelect and explain. \nA. Bolton point, B. Glabella, C. Prosthion, D. Basion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]