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
Potassium channel opener with anti–anginal activity is: 
Select and explain. 
A. Nicorandil, B. Dipyridamole, C. Trimetazidine, D. Oxyfedrine
A: Nicorandil
Answer: A: Nicorandil 
Explanation: None