This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CHF, Angina Pectoris and Myocardial Infarction, Subject name: Pharmacology
[{'content': 'A drug lacking vasodilatory propeies that is effective in angina is: \nSelect and explain. \nA. Isosorbide dinitrate (IDN), B. Metoprolol, C. Nifedipine, D. Verapamil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Beta blockers act in angina by decreasing exercise induced myocardial work by reducing HR. These do not cause vasodilation. Nitrates (IDN) and CCBs (Nifedipine, Verapamil) act by causing vasodilation.', 'role': 'assistant'}]