**Core Concept**
The question is testing the knowledge of a specific histological stain used for detecting fungal elements in tissue samples. The correct stain is a type of dye that selectively binds to fungal components, allowing for their visualization under a microscope.

**Why the Correct Answer is Right**
The correct stain is **Grocott's Methenamine Silver (GMS)**. GMS is a sensitive and specific stain used for detecting fungal elements, particularly in tissue sections. It works by selectively staining the fungal cell walls, which contain chitin and other polysaccharides. The stain consists of a combination of methenamine and silver nitrate, which reacts with the fungal cell walls to produce a dark brown or black color. This allows for the visualization of fungal elements, such as hyphae and yeast cells, under a microscope.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a specific stain used for detecting fungal elements. It may be a general term for a type of stain, but it is not the correct answer.
* **Option B:** This is not a commonly used stain for detecting fungal elements. It may be used for other types of histological staining, but it is not the correct answer.
* **Option C:** This is not a specific stain used for detecting fungal elements. It may be a type of stain used for other types of histological staining, but it is not the correct answer.

**Clinical Pearl / High-Yield Fact**
GMS stain is a sensitive and specific stain for detecting fungal elements, particularly in tissue sections. It is often used in conjunction with other stains, such as hematoxylin and eosin (H&E), to aid in the diagnosis of fungal infections.

**Correct Answer: C. Grocott's Methenamine Silver (GMS)**