**Core Concept**
Tooth development, also known as odontogenesis, is a complex process involving the coordinated action of multiple cell types and molecular signals. Vitamins play a crucial role in this process by providing essential nutrients for cell growth, differentiation, and mineralization.

**Why the Correct Answer is Right**
Vitamin D is well-known for its role in calcium homeostasis and bone mineralization. However, it does not directly participate in tooth development. Instead, vitamin D regulates the expression of genes involved in enamel formation, such as enamelin and amelogenin. The correct answer is not directly involved in tooth development, unlike vitamins A, C, and B2, which are essential for the growth and differentiation of dental tissues.

**Why Each Wrong Option is Incorrect**
**Option A:** Vitamin A is crucial for the differentiation of ameloblasts, the cells responsible for enamel formation. It also regulates the expression of genes involved in tooth development, making it a vital nutrient for tooth growth.
**Option B:** Vitamin C is essential for the production of collagen, a key component of dental tissues, including dentin and cementum. It also plays a role in the mineralization of teeth by regulating the activity of alkaline phosphatase, an enzyme involved in calcium deposition.
**Option C:** Vitamin B2 (riboflavin) is necessary for the synthesis of flavin adenine dinucleotide (FAD), a coenzyme involved in various cellular processes, including energy production and the synthesis of fatty acids. Riboflavin deficiency can lead to impaired tooth development and mucosal lesions.

**Clinical Pearl / High-Yield Fact**
Tooth development is a complex process involving multiple vitamins and nutrients. A deficiency in any of these essential nutrients can lead to impaired tooth growth, development, and mineralization, resulting in various dental abnormalities.

**Correct Answer:** D. Vitamin D