**Core Concept:** Post-mortem staining is a technique used to preserve and enhance the visibility of certain structures on a histological slide prepared from a formalin-fixed tissue sample. Different staining methods reveal specific cellular components, such as nuclei, cytoplasm, or collagen.

**Why the Correct Answer is Right:**
The correct answer is **Option C: Ziehl-Neelsen Staining**. This staining technique is specific for acid-fast bacteria, such as Mycobacterium tuberculosis, which cause tuberculosis (TB). The staining process involves the use of carbolfuchsin and acid-alcoholic alcoholic orange G (AFB) to highlight the acid-fast nature of the bacteria, giving them a distinctive "chocolate" color (brownish-reddish) when observed under polarized light.

**Why Each Wrong Option is Incorrect:**
- **Option A (H&E staining):** This staining technique, involving hematoxylin and eosin dyes, is used for general histological examination and staining of nuclei and cytoplasm. It does not highlight acid-fast bacteria, making it irrelevant for detecting TB.
- **Option B (Giemsa staining):** Similar to H&E staining, this technique stains nuclei and cytoplasm but is not specific for acid-fast bacteria. It is not useful for detecting TB.
- **Option D (Periodic Acid-Schiff staining):** This staining technique highlights carbohydrates and glycoproteins but is not specific for acid-fast bacteria. It is not suitable for detecting TB.

**Clinical Pearl:**
Understanding the correct staining method (Ziehl-Neelsen staining) and its application in detecting TB is crucial for medical professionals, especially in the context of diagnosing TB in clinical practice. Timely and accurate diagnosis of TB is essential for appropriate treatment and control of the disease.

**Correct Answer:** Option C: Ziehl-Neelsen Staining