**Core Concept**
Amyloid detection is critical in diagnosing amyloidosis, a condition characterized by the deposition of amyloid fibrils in various tissues. Amyloid fibrils have a unique beta-pleated sheet structure, which is essential for their detection using specific stains. Various dyes and stains have been developed to detect amyloid deposits in tissues.

**Why the Correct Answer is Right**
Alcian Blue is primarily used to stain acidic mucopolysaccharides, such as glycosaminoglycans, in tissues. It is not specific for amyloid detection and can lead to false-positive results. In contrast, Congo Red, Methyl Violet, and Thioflavin T are specific stains used for amyloid detection. Congo Red is the most commonly used stain for amyloid detection, as it exhibits green birefringence under polarized light when bound to amyloid fibrils. Methyl Violet and Thioflavin T are also used for amyloid detection, although they are less specific than Congo Red.

**Why Each Wrong Option is Incorrect**
**Option A:** Methyl Violet is indeed used for amyloid detection, as it stains amyloid fibrils and exhibits green birefringence under polarized light.
**Option C:** Congo Red is a specific stain for amyloid detection and is widely used in pathology laboratories.
**Option D:** Thioflavin T is also used for amyloid detection, as it binds to amyloid fibrils and exhibits fluorescence under UV light.

**Clinical Pearl / High-Yield Fact**
When performing amyloid detection, it is essential to use specific stains, such as Congo Red, to avoid false-positive results. Alcian Blue, while useful for staining acidic mucopolysaccharides, is not specific for amyloid detection and should not be used as a substitute for Congo Red.

**✓ Correct Answer: B. Alcain Blue**