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
Which of the following membrane has the highest protein content per gram tissue: 
Select and explain. 
A. Inner mitochondria' membrane, B. Outer mitochondrial membrane, C. Plasma membrane, D. Myelin sheath
A: Inner mitochondria' membrane
Answer: A: Inner mitochondria' membrane 
Explanation: A i.e. Inner mitochondrial membrane