This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Precapillary pulmonary hypeension is caused by all except \nSelect and explain. \nA. Mitral stenosis, B. Pulmonary vasculitis, C. Primary pulmonary hypeension, D. Thromboembolism', 'role': 'user'}, {'content': "Answer: A \nExplanation: Category 2. Pulmonary venous hypeensionKey feature: elevation in PAP with elevation in PCWPIncludes:Left-sided atrial or ventricular hea diseaseLeft-sided valvular hea diseasePulmonary venous obstructionPulmonary Veno-occlusive disease (PVOD)Ref: Harrison's 18/e p2077, 2079", 'role': 'assistant'}]