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: Medicine
[{'content': 'Swan Ganz Catheter is used to measure: September 2005 \nSelect and explain. \nA. Mean aerial pressure, B. Cardiac output, C. Blood volume, D. Pulmonary capillary wedge pressure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Pulmonary capillary wedge pressure Swan Gann Catheter is a long, thin cardiac catheter with a tiny balloon at the tip. It is used to determine left ventricular function by measuring pulmonary capillary wedge pressure.', 'role': 'assistant'}]