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': 'Which of the following does not represent a significant anaesthetic problem in the morbidly obese patient ? \nSelect and explain. \nA. Difficulties in endotracheal intubation, B. Suboptimal arterial oxygen tension, C. Increased metabolism of volatile agents, D. Decreased cardiac output relative to total body mass', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cardiac output is increased (not decreased) in morbid obesity. There is difficult intubation, hypoxemia and rapid metabolism of volatile anesthetics.', 'role': 'assistant'}]