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': 'Nasal valve is formed by - \nSelect and explain. \nA. Upper lateral cartilage, B. Lower lateral cartilage, C. Lower end of upper lateral cartilage, D. Upper end of lower lateral cartilage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The upper limit of vestibule on the lateral wall is marked by limen nasi (nasal valve) which is formed by the caudal (inferior) margin of upper lateral cartilage.', 'role': 'assistant'}]