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
[{'content': 'The predominant isozyme of LDH in cardiac muscle is \nSelect and explain. \nA. LD-1, B. LD-2, C. LD-3, D. LD-5', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]