**Core Concept**
The detection of lipid in tissue involves identifying the presence of lipids, which are a class of biomolecules that include fats, oils, and waxes. Lipid detection is crucial in various medical applications, including histopathology, where it helps in diagnosing conditions such as fatty liver disease or identifying the presence of tumors.

**Why the Correct Answer is Right**
The correct answer is Sudan III, a lipophilic dye that selectively stains lipids in tissue samples. Sudan III works by binding to the lipid molecules, which allows for the visualization of lipids under a microscope. This process is based on the principle of lipophilicity, where lipophilic compounds tend to dissolve in lipids.

**Why Each Wrong Option is Incorrect**
**Option A:** H&E (Hematoxylin and Eosin) staining is a general-purpose staining technique used in histopathology, but it is not specific for lipid detection.
**Option B:** Oil Red O is another lipophilic dye used in histology, but it is more commonly used to detect neutral triglycerides in adipocytes.
**Option C:** Alcian Blue is a mucin stain used in histology to detect the presence of mucin in tissues, but it is not specific for lipid detection.

**Clinical Pearl / High-Yield Fact**
When performing lipid detection in tissue samples, it is essential to use a lipophilic dye, such as Sudan III, to ensure accurate results. This is because lipophilic dyes selectively bind to lipids, allowing for the visualization of lipids under a microscope.

**Correct Answer: D. Sudan III.**