**Core Concept**
The composition of cellular membranes varies in different organelles, with some having a higher lipid content and others having a higher protein content. This question tests the knowledge of the specific organelle that has a balance between lipid and protein components.

**Why the Correct Answer is Right**
The mitochondria is a unique organelle that has a balanced composition of lipids and proteins. The mitochondrial membrane contains approximately 70-80% lipids and 20-30% proteins. This balance is crucial for maintaining the fluidity and permeability of the mitochondrial membrane. The lipid-rich inner mitochondrial membrane is involved in the electron transport chain, while the protein-rich outer membrane contains porins that regulate the movement of molecules in and out of the mitochondria.

**Why Each Wrong Option is Incorrect**
* **Option A:** The plasma membrane is primarily composed of lipids (about 50-60%) but has a higher protein content compared to the mitochondrial membrane. Therefore, it is not the correct answer.
* **Option B:** The lysosomal membrane has a higher lipid content than protein content, which is not in line with the balanced composition of the mitochondrial membrane.
* **Option C:** The nuclear envelope is composed of lipids and proteins, but the protein content is higher than the lipid content, which is not the case for the mitochondrial membrane.

**Clinical Pearl / High-Yield Fact**
The mitochondrial membrane's unique composition allows for the efficient transfer of electrons during oxidative phosphorylation, which is essential for generating ATP in the cell.

**Correct Answer: C. Mitochondria**