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
Precapillary pulmonary hypeension is caused by all except 
Select and explain. 
A. Mitral stenosis, B. Pulmonary vasculitis, C. Primary pulmonary hypeension, D. Thromboembolism
A: Mitral stenosis
Answer: A: Mitral stenosis 
Explanation: 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