**Core Concept**
Dental fusion is a developmental anomaly where two or more adjacent teeth fail to separate completely during embryonic development, resulting in a single tooth with two or more distinct tooth crowns. This condition is distinct from other dental anomalies such as gemination, concrescence, and supernumerary teeth.

**Why the Correct Answer is Right**
Dental fusion occurs due to the incomplete separation of dental lamina during tooth development. This can lead to a single tooth with two or more distinct crowns, each with its own pulp chamber and root. The affected teeth may be partially merged or completely fused, resulting in a single tooth structure. Dental fusion is often seen in conjunction with other dental anomalies and can be associated with genetic syndromes or systemic diseases.

**Why Each Wrong Option is Incorrect**
**Option A:** Gemination is a different developmental anomaly where a single tooth bud attempts to form two teeth, resulting in a single tooth with an elongated or bifid shape. Gemination can be confused with dental fusion, but it is characterized by a single tooth structure rather than two distinct crowns.
**Option B:** Concrescence is a type of dental anomaly where two or more adjacent teeth are joined together by cementum or bone, but the individual tooth crowns remain separate. Unlike dental fusion, concrescence does not involve the fusion of tooth crowns.
**Option C:** Supernumerary teeth are extra teeth that develop in addition to the normal complement of teeth. While supernumerary teeth can be associated with dental fusion, they represent a distinct developmental anomaly.

**Clinical Pearl / High-Yield Fact**
Dental fusion is often seen in conjunction with other dental anomalies and can be associated with genetic syndromes such as cleidocranial dysplasia or systemic diseases like ectodermal dysplasia. Familiarity with these associations can help clinicians diagnose and manage patients with dental fusion.

**✓ Correct Answer: A. Dental fusion**