This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drug causing decrease in late sodium current - \nSelect and explain. \nA. Nicorandil, B. Ranolazine, C. Trimetazidine, D. Molsidominc', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Ranolazine o Ranolazine was initially assigned as paial fatty acid oxidation inhibitors. However, now it is believed that it acts by a different mechanism. It acts by blocking a late sodium current that facilitates calcium NCX (Sodium -Calcium exchanger) -4 Calcium overload and decrease left ventricular wall tension --> decreased myocardial oxygen demand.", 'role': 'assistant'}]