This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Normal PCWP with pulmonary oedema is seen in \nSelect and explain. \nA. Left atrial myxoma, B. High altitude, C. Pulmonary vein obstruction, D. Pulmonary aery obstruction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 19 th ed pg 1763 The use of a Swan-Ganz catheter permits measurement of PCWP and helps differentiate high-pressure (cardiogenic) from normal- pressure (noncardiogenic) causes of pulmonary edema. High altitude has been grouped together as one of the miscellaneous causes for ARDS reflecting pulmonary oedema with a normal PCWP', 'role': 'assistant'}]