**Core Concept:**

The Cusp of Carabelli is a developmental anomaly characterized by the presence of a small additional cusp-like projection on the occlusal surface of certain permanent maxillary molars. This anomaly is found in approximately 5-10% of the general population and can lead to altered occlusal contacts and tooth wear.

**Why the Correct Answer is Right:**

The Cusp of Carabelli is present on the occlusal surface of the permanent maxillary first molar (option C). The occlusal surface of a normal maxillary first molar typically consists of four cusps: the mesiobuccal (MB), distobuccal (DB), palatal (P), and distolingual (DL) cusps. However, in cases of Cusp of Carabelli, an additional small cuspal projection is formed due to developmental abnormalities during tooth formation.

**Why Each Wrong Option is Incorrect:**

Option A refers to the permanent mandibular first molar, which does not have a Cusp of Carabelli. Option B refers to the permanent mandibular second molar, which also lacks this anomaly. Option D refers to the permanent maxillary second molar, which is incorrect as it is the permanent maxillary first molar that typically exhibits the Cusp of Carabelli.

**Clinical Pearl / High-Yield Fact:**

The presence of a Cusp of Carabelli can be considered a normal variant in some populations, but it can also indicate a higher risk for occlusal wear, increased tooth mobility, and even caries due to altered occlusal contacts. It is important for clinicians to be aware of this anomaly when examining patients for proper diagnosis and treatment planning.