This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiomyopathy & Pericarditis, Subject name: Medicine
[{'content': 'Most common cause of dilated cardiomyopathy is? \nSelect and explain. \nA. Alcohol, B. Viral infection, C. Pregnancy, D. Metabolic disease', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) AlocholRef: Braundwald's Heart Disease Ninth edition, Chapter 64", 'role': 'assistant'}]