**Core Concept**
The cusp of Carabelli is an anatomical structure on the maxillary first molar tooth, representing an additional cusp on the buccal surface. It is a morphological variation that occurs in a significant portion of the population.

**Why the Correct Answer is Right**
The cusp of Carabelli is formed by the presence of an additional cusp on the buccal surface of the maxillary first molar tooth. This is due to the presence of an extra cusp of the buccal groove, which is a result of the development of the tooth bud. The buccal groove is a V-shaped fissure on the buccal surface of the maxillary first molar, and the cusp of Carabelli is an extension of this groove.

**Why Each Wrong Option is Incorrect**
**Option A:** The cusp of Carabelli is not typically found on the mandibular first molar tooth.
**Option B:** The cusp of Carabelli is not a characteristic of the maxillary second molar tooth.
**Option C:** The cusp of Carabelli is not a developmental anomaly, but rather a normal anatomical variation.

**Clinical Pearl / High-Yield Fact**
The cusp of Carabelli is an important landmark in dental anatomy, as it can be used to identify the maxillary first molar tooth. It is also a key feature in the diagnosis of certain dental anomalies and developmental disorders.

**Correct Answer:** C. The maxillary first molar tooth.