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
Which drugs show coronary steal phenomenon? 
Select and explain. 
A. Dipyridamole, B. Nitrates, C. Nifedipine, D. Nicorandil
A: Dipyridamole
Answer: A: Dipyridamole 
Explanation: 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.