This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Swan Ganz Catheter is used to measure \nSelect and explain. \nA. Mean aerial pressure, B. Cardiac output, C. Blood volume, D. Pulmonary capillary wedge pressure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The pulmonary aery catheter allows direct, simultaneous measurement of pressures in the right atrium, right ventricle, pulmonary aery, and the filling pressure ("wedge" pressure) of the left atrium.', 'role': 'assistant'}]