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': 'The most common cause of hypoxia during one lung ventilation is: \nSelect and explain. \nA. Malposition of the double lumen tube, B. Increased shunt fraction, C. Collapse of one lung, D. Soiling of lung by secretions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Malposition of the double lumen tube - Malposition of a double lumen tube is usually indicated by poor lung compliance and low exhaled tidal volume Most common cause of hypoxemia during one lung ventilation is malposition of double lumen tube.Q Hypoxemia can also occur due to occlusion of tube & increased shunt fraction.', 'role': 'assistant'}]