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: Physiology
Marker Enzyme of Mitochondria are/is: 
Select and explain. 
A. Na+ - K+ ATPase, B. Glutamic dehydrogenase, C. Lactate dehydrogenase, D. No specific enzyme
B: Glutamic dehydrogenase
Answer: B: Glutamic dehydrogenase 
Explanation: B i.e. Glutamic dehydrogenase