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
Potassium channel openers with anti anginal drug is: 
Select and explain. 
A. Nicorandil, B. Dipyridamole, C. Trimetazidine, D. Oxyphedrine
A: Nicorandil
Answer: A: Nicorandil 
Explanation: (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