This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'Placement of a This tube for lung surgery is best confirmed by \nSelect and explain. \nA. EtCO2, B. Airway pressure measurement, C. Clinically by auscultation, D. Bronchoscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]