This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'Nasal valve is formed by all except: \nSelect and explain. \nA. Septum, B. Middle turbinate, C. Lower end of upper lateral cailage, D. Inferior turbinate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Anterior nasal valve it is the narrowest pa of nose and is less well defined physiologically than anatomically. It is formed by the lower edge of the upper lateral cailages, the anterior end of the inferior turbinate and the adjacent septum. Ref. Dhingra 5/e, p 150.', 'role': 'assistant'}]