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: ENT
[{'content': 'All of the following paranasal sinuses drain into middle meatus, EXCEPT: \nSelect and explain. \nA. Lacrimal duct, B. Maxillary sinus, C. Frontal sinus, D. Anterior group of ethmoidal sinus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]