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 audit maxillary sinus measures about \nSelect and explain. \nA. 33mm in height, 23mm in width, B. 33mm in width, 23mm in height, C. 30mm in height, 8 mm in width, D. 8mm in height, 30mm in width', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]