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: Anaesthesia
[{'content': 'True about endotracheal intubation is – \nSelect and explain. \nA. It reduces normal anatomical dead space, B. It produces decrease in resistance to respiration, C. Subglottic edema is most common complication, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Intubation decreases the dead space, as nasal space is bypassed and the lumen of endotracheal tube is less than that of natural airway.\nEndotracheal intubation increases the airway resistance.\nBronchial intubation is the most common perioperative complication and sore throat is the most common post operative complication.', 'role': 'assistant'}]