<prompt> True about endotracheal intubation isIt reduces normal anatomical dead spaceIt produces decrease in resistance to respirationSubglottic edema is most common complicationAll of the above  <response>: Intubation decreases the dead space, as nasal space is bypassed and the lumen of endotracheal tube is less than that of natural airway.Endotracheal intubation increases the airway resistance.Bronchial intubation is the most common perioperative complication and sore throat is the most common post operative complication. 