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
Damage to RBC resulting in their lysis, increases which isoenzyme in blood? 
Select and explain. 
A. LDH-1, B. LDH-3, C. LDH-4, D. LDH-5
A: LDH-1
Answer: A: LDH-1 
Explanation: LDH 1 is pre-dominantly present in RBCs and smooth muscle of heart, thus when RBCs are damaged, LDH1 is raised.