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
[{'content': 'A patient Amit Kumar is suffering from atherosclerosis. Which of the following is the most beneficial drug for prevention of stroke in this patient ? \nSelect and explain. \nA. Aspirin, B. Warfarin, C. Low dose subcutaneous heparin, D. Digoxin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]