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': 'Swan Ganz catheter measure \nSelect and explain. \nA. PCWP, B. C.O., C. Mixed venous 02 saturation, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. PCWP; B i.e. CO; C i.e. Mixed venous 02 saturation', 'role': 'assistant'}]