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: Unknown
The predominant isoenzyme of LDH in the cardiac muscle is? 
Select and explain. 
A. LDH – 1, B. LDH – 2, C. LDH – 3, D. LDH – 5
A: LDH – 1
Answer: A: LDH – 1 
Explanation: In normal plasma LDH-2 is more in concentration than LDH – 1.
In myocardial infarction level of LDH – 1 increases and this leads to altered ratio of LDH.
It means LDH – 1 > LDH – 2.
This altered ratio of the LDH is known as flipped pattern.