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
In which of the following conditions the level of creatinine kinase 1 increases? 
Select and explain. 
A. Myocardial ischemia, B. Brain Ischemia, C. Kidney damage, D. Electrical cardioversion
B: Brain Ischemia
Answer: B: Brain Ischemia 
Explanation: Ans. B. Brain IschemiaLocalization of CPK isoenzymesa. CPK 1 (CPK BB) - Brainb. CPK 2 (CPK MB) - Myocardiumc. CPK 3 (CPK MM) - Skeletal muscle