**Core Concept**
Ameloblasts are specialized cells responsible for the formation of enamel in teeth. They are ectodermal in origin, specifically derived from the dental lamina, a ridge of cells that gives rise to the teeth during embryonic development.

**Why the Correct Answer is Right**
The correct answer, **D. Dental Lamina**, is supported by the fact that ameloblasts differentiate from the dental lamina, a layer of ectodermal cells that proliferate to form the tooth germ. As the tooth germ develops, the cells of the dental lamina differentiate into ameloblasts, which then produce enamel by secreting amelogenin proteins. The interaction between ameloblasts and the underlying mesenchyme (odontoblasts) is crucial for the formation of the dentino-enamel junction.

**Why Each Wrong Option is Incorrect**
**Option A:** Mesenchyme - Incorrect because mesenchyme gives rise to odontoblasts, not ameloblasts.
**Option B:** Neural Crest - Incorrect because neural crest cells contribute to the development of various tissues, including cartilage, bone, and connective tissue, but not directly to the formation of ameloblasts.
**Option C:** Epithelial Stem Cells - Incorrect because while epithelial stem cells are involved in various developmental processes, they are not specifically responsible for the formation of ameloblasts.

**Clinical Pearl / High-Yield Fact**
The development of ameloblasts from the dental lamina is a critical process in tooth formation, and any disruptions to this process can result in developmental anomalies, such as amelogenesis imperfecta.

**Correct Answer: D. Dental Lamina**