**Core Concept**
The brain is a highly complex and sensitive organ that requires specialized handling and preservation to prevent structural changes and maintain its integrity for pathological analysis. This is crucial for accurate diagnosis and understanding of neurological disorders.

**Why the Correct Answer is Right**
The correct answer is Formalin Fixation (10% formalin solution). Formalin fixation is a widely used method for preserving the brain, which involves immersing the brain in a 10% solution of formaldehyde. This process helps to:

* Prevent autolysis and degradation of brain tissue
* Maintain the structural and cellular integrity of the brain
* Allow for detailed histological examination and staining

**Why Each Wrong Option is Incorrect**
* **Option A:** Autoclaving is a method of sterilization, which involves high-pressure steam, and is not suitable for preserving the brain for pathological analysis.
* **Option B:** Freezing is a method of preserving tissue, but it can cause ice crystal formation and damage to brain tissue, making it unsuitable for detailed histological examination.
* **Option C:** Ethanol fixation is not typically used for preserving the brain, as it can cause shrinkage and distortion of the tissue.

**Clinical Pearl / High-Yield Fact**
When handling and preserving the brain for pathological analysis, it is essential to follow strict protocols to maintain the integrity of the tissue, as changes in the brain's structure can significantly impact the accuracy of diagnosis and understanding of neurological disorders.

**Correct Answer: C. Formalin Fixation (10% formalin solution)**