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: Anatomy
[{'content': 'Maxillary sinus drains into ? \nSelect and explain. \nA. Inferior meatus, B. Middle meatus, C. Superior meatus, D. Sphenoethmoidal recess', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Middle meatus', 'role': 'assistant'}]