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
[{'content': 'Which of the following does not cause pulmonary hypertension? \nSelect and explain. \nA. Sickle cell anemia, B. Fenfluramine, C. Hyperventilation, D. Scleroderma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) HyperventilationREF: Harrison 17th ed chapter 244Fenfluramine is known to cause PAHPulmonary arterial hypertension (PAH)Idiopathic (IPAH) (formerly PPH)Familial (FPAH)Associated with (APAH):C ollagen vascular diseas eCongenital systemic-to- pulmonary shuntsPortal hypertensionHIV infectionDrugs and toxinsOther (thyroid disorders, glycogen storage disease, Gaucher disease, hereditary hemorrhagic telangiectasia, hemoglobinopathies, myeloproliferative disorders, splenectomy)Associated with significant venous or capillary involvementPulmonary veno-occlusive disease (PVOD)Pulmonary capillary hemangiomatosis (PCH)Persistent pulmonary hypertension of the newbornPulmonary hypertension with left heart diseaseLeft-sided atrial or ventricular heart diseaseLeft-sided valvular heart diseasePulmonary hypertension associated with lung diseases and/or hypoxemiaChronic obstructive pulmonary diseaseInterstitial lung diseaseSleep-disordered breathingAlveolar hypoventilation disordersChronic exposure to high altitudeDevelopmental abnormalitiesPulmonary hypertension due to chronic thrombotic and/or embolic diseaseThromboembolic obstruction of proximal pulmonary arteriesThromboembolic obstruction of distal pulmonary arteriesNonthrombotic pulmonary embolism (tumor, parasites, foreign material)MiscellaneousSarcoidosis, histiocytosis X, lymphangiomatosis, compression of pulmonary vessels (adenopathy, tumor, fibrosing mediastinitis)', 'role': 'assistant'}]