This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Biochemistry
The predominant isozyme of LDH in cardiac muscle is 
Select and explain. 
A. LD-1, B. LD-2, C. LD-3, D. LD-5
A: LD-1
Answer: A: LD-1 
Explanation: In myocardial infarction, total LDH activity is increased, while H4 iso-enzyme ( monomer of LDH ) is increased 5-10 times more. The magnitude of the peak value, as well as the area under the graph, will be roughly propoional to the size of the myocardial infarct. Ref: D M Vasudevan 7th edition Page no: 304