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: Pharmacology
[{'content': 'Which of the following is not used in the treatment of pulmonary hypertension? \nSelect and explain. \nA. Calcium channel blockers, B. Alpha blockers, C. Prostacyclins, D. Endothelin receptor antagonists', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Alpha blockers(Ref: CMDT 2010/381)Management of Idiopathic Pulmonary Hypertension*If the patient responds to vasodilators, then calcium channel blockers (including amlodipine, diltiazem, and nifedipine) are the first-line therapy.Other drugs that can be used are:-Phosphodiesterase inhibitors (e.g. sildenafil)-Prostacyclin analogs (e.g. epoprostenol)-endothelin receptor blockers (e.g. bosentan)', 'role': 'assistant'}]