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: Surgery
[{'content': 'The endotracheal tube is inserted in: \nSelect and explain. \nA. Right bronchus, B. Left bronchus, C. Trachea, D. in laryngopharynx', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]