**Core Concept**
A Le Fort fracture is a type of facial fracture that involves the separation of the facial bones from the cranial base. It is classified into three types based on the level of fracture: Le Fort I (horizontal), Le Fort II (pyramidal), and Le Fort III (craniofacial disjunction). Le Fort III fractures are the most severe and involve the separation of the facial bones from the cranial base.

**Why the Correct Answer is Right**
Le Fort III fractures are characterized by a complete separation of the facial bones from the cranial base, resulting in a craniofacial disjunction. This type of fracture typically occurs due to high-energy trauma, such as a severe head injury or a motor vehicle accident. The fracture line extends from the nasal bones to the zygomatic arches, and the lacrimal bones and orbital floor are often involved. The separation of the facial bones from the cranial base can lead to significant displacement and instability of the facial skeleton.

**Why Each Wrong Option is Incorrect**
**Option A:** Le Fort I fractures are characterized by a horizontal fracture line through the maxilla, but they do not involve the separation of the facial bones from the cranial base. Therefore, they are not known as craniofacial disjunction.

**Option B:** Le Fort II fractures are characterized by a pyramidal fracture line that extends from the nasal bones to the zygomatic arches, but they do not involve the complete separation of the facial bones from the cranial base. Therefore, they are not known as craniofacial disjunction.

**Option D:** There is no such classification as Le Fort IV fracture. The correct classification of Le Fort fractures includes Le Fort I, Le Fort II, and Le Fort III.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that Le Fort III fractures are the most severe type of Le Fort fracture and can lead to significant morbidity and mortality if not promptly treated. Early recognition and management of these fractures are crucial to prevent long-term complications, such as facial deformity and vision loss.

**Correct Answer:** C. Le Fort III fracture is known as craniofacial disjunction.