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': 'Pulmonary edema PCWP- \nSelect and explain. \nA. >28 mm Hg, B. 15 mm Hg, C. > 10 mm Hg, D. > 8 mmg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]