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: Medicine
[{'content': 'Serum creative kinase-3 (CK-3) is elevated in - \nSelect and explain. \nA. Muscular dystrophy, B. Myocardial infarction, C. Alcoholic cirrhosis, D. Brain tumours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]