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
Normal PCWP with pulmonary oedema is seen in - 
Select and explain. 
A. Left atrial myxoma, B. High altitude, C. Pulmonary vein obstruction, D. Pulmonary aery obstruction
B: High altitude
Answer: B: High altitude 
Explanation: HIGH ALTITUDE PULMONARY EDEMA : Though it remains a topic of intense investigation, multiple studies and reviews over the last several years have helped to elucidate the proposed mechanism of HAPE. The inciting factor of HAPE is the decrease in paial pressure of aerial ).The resultant ) secondary to ) with over-distention of the capillary beds and increased may not in itself be sufficient to explain the development of Ref Harrison 20th edition pg 1456