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 - \nSelect and explain. \nA. Right artial flow, B. Pulmonary capillary pressure, C. Central venous pressure, D. Right ventricular pressure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]