## **Core Concept**
The question pertains to the comparison of protein content in different types of biological membranes. Biological membranes are primarily composed of lipids and proteins, with the protein content varying significantly depending on the membrane's function and location within the cell.

## **Why the Correct Answer is Right**
The correct answer, , refers to the **myelin sheath** surrounding neuronal axons. However, given the usual context of such questions, it seems there might be a confusion in the representation of the correct answer. Typically, the **plasma membrane** has a high protein content, which can range but often is around 50% or more by weight. Myelin, produced by Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system, indeed has a significant lipid content but also a notable protein content, particularly for its function and structure. However, when comparing, **mitochondrial inner membrane** stands out for its exceptionally high protein content, which can be as high as 75% by weight, due to the presence of the electron transport chain complexes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option would be incorrect if it represents a membrane with lower protein content compared to . For instance, if it represents the myelin sheath, it indeed has a high lipid content but not the highest protein content per gram of tissue compared to some other membranes.
- **Option B:** Similarly, this would be incorrect based on the specific protein content comparison. Without specific details on what each option represents, we infer based on common knowledge of membrane biology.
- **Option D:** This option is incorrect because it presumably represents a membrane with lower protein content than .

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the **mitochondrial inner membrane** has an exceptionally high protein-to-lipid ratio, which is crucial for its role in energy production through the electron transport chain. This is a critical concept in understanding cellular respiration and the structure-function relationship of biological membranes.

## **Correct Answer: C. Mitochondrial Inner Membrane**