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: Biochemistry
Fraction of CPK is an enzyme that is elevated in a myocardial infarct is: 
Select and explain. 
A. MM fraction, B. MB fraction, C. BB fraction, D. Both MM and BB fraction
B: MB fraction
Answer: B: MB fraction 
Explanation: None