This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Which drugs show coronary steal phenomenon? \nSelect and explain. \nA. Dipyridamole, B. Nitrates, C. Nifedipine, D. Nicorandil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Isoflurane, dipyridamole produce coronary steal phenomenon in which blood is deted from ischemic area to non-ischemic area-stealing the mail pool of blood in needy area. ref. HL Sharma 3rd ed.', 'role': 'assistant'}]