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': 'Narrowest part of Infants respiratory tract \nSelect and explain. \nA. Glottis, B. Subglottis, C. Carina, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Q neonates narrowest part of larynk : Subglottis.\nQ adutls\xa0narrowest part of larynk : Glottis.', 'role': 'assistant'}]