**Core Concept**
Enamel, the hardest substance in the human body, is composed of highly mineralized, non-living, and non-vascularized tissue that covers the crown of teeth. The fibrous elements within enamel are crucial for its structural integrity and durability.

**Why the Correct Answer is Right**
The correct type of fibrous element in enamel is **amelogenin**-related, more specifically, **ameloblast-produced enamel matrix proteins** (also known as **amelogenin**). These proteins self-organize into **nucleating sites** that eventually form **enamel crystallites**. The precise arrangement of these crystallites is essential for the enamel's strength and translucency.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect as there is no such type of fibrous element in enamel. While enamel does contain proteins, the specific term "amelogenin" is the correct answer.
* **Option B:** This option does not accurately describe the fibrous elements in enamel. **Collagen** is the main protein found in dentin, not enamel.
* **Option C:** This is incorrect as there is no direct association between **elastin** and enamel. Elastin is a protein found in connective tissue, particularly in skin and elastic cartilage.

**Clinical Pearl / High-Yield Fact**
It's essential for dental students and clinicians to understand the unique composition and properties of enamel, which is why the correct answer is **amelogenin**. This knowledge can aid in the diagnosis and treatment of dental conditions related to enamel defects or abnormalities.

**Correct Answer:** A. Amelogenin.