This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology of nose, Subject name: ENT
[{'content': 'Fronto-nasal duct opens into: \nSelect and explain. \nA. Inferior meatus, B. Middle meatus, C. Superior meatus, D. Inferior turbinate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The Frontal sinus opens in the middle meatus through a duct known as fronto-nasal duct or frontal recess.', 'role': 'assistant'}]