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: Surgery
[{'content': 'Serum Creatine PhosphoKinase-3 (CPK-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: Musculardystrophy CreatineKinase(CK)or CreatinePhosphokinase(CPK)catalysestheinterconversionof phosphocreatineto creatine. CPKexistsasthreeisoenzymes.Eachisoenzymeisa dimercomposedoftwosubunits- M(muscle)orB (Brain)orboth Isoenzyme SubUnit Tissueoforigin CPK1 BB Brain CPK2 MB Hea CPK3 MM SkeletalMuscle', 'role': 'assistant'}]