This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
[{'content': 'In which of the following conditions the level of creatinine kinase 1 increases? \nSelect and explain. \nA. Myocardial ischemia, B. Brain Ischemia, C. Kidney damage, D. Electrical cardioversion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Brain IschemiaLocalization of CPK isoenzymesa. CPK 1 (CPK BB) - Brainb. CPK 2 (CPK MB) - Myocardiumc. CPK 3 (CPK MM) - Skeletal muscle', 'role': 'assistant'}]