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 hypeension in COPD is due to all, Except: \nSelect and explain. \nA. Hypoxia, B. Pulmonary vasoconstriction, C. High lung volume, D. Bronchoconstriction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Bronchoconstriction) Bronchoconstriction is not a cause for Pulmonary Hypeension Pulmonary Hypeension in COPD has been attributed to multiple factors including: Hypoxia Pulmonary vasoconstriction (secondary to hyoxia) Acidemia Hypercapnia Mechanical effect of high lung volume on pulmonary vessels Loss of small vessels in vascular bed Regions of emphysematous lung destruction', 'role': 'assistant'}]