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': 'Potassium channel openers with anti anginal drug is: \nSelect and explain. \nA. Nicorandil, B. Dipyridamole, C. Trimetazidine, D. Oxyphedrine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Nicorandil): Ref: 499-KDT (534-KDT 6th)POTASSIUM-CHANNEL-OPENERS* Minoxidil, diazoxide used in hypertension, hyperensive emergencies* Nicorandil, pinacidil, cromakalinNICORANDIL: - This novel antianginal drug activates ATP sensitive K+ channels - hyperpolarizing vascular smooth muscle the vasodilator action is partly antagonized by K+ channel blocker glibenclamide* Dipyridamol, Trimetazidine, oxyphedrine are antianginal drugs', 'role': 'assistant'}]