This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'Which of the following statements true about high attitude pulmonary edema.? \nSelect and explain. \nA. Not exacerbated by exercise, B. Associated with pulmonary vasoconstriction, C. Occurs only in unacclamatized individuals, D. Associated with low cardiac output', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 19 th ed pg 476e-6 AlthrouA the mechanism of high attitude pulmonary edema remains obscure most studies suggest pulmonary vasoconstriction as the prime individuals.', 'role': 'assistant'}]