**Core Concept**
Epiphora refers to an abnormal overflow of tears onto the face, often resulting from an obstruction or dysfunction of the tear drainage system. In the context of facial trauma, various fractures can compromise the integrity of this system, leading to epiphora.

**Why the Correct Answer is Right**
Zygomatic complex fractures primarily affect the cheekbone area, which is not directly involved in the tear drainage system. The lacrimal apparatus, responsible for tear production and drainage, is located in the medial canthus (the area between the nose and the eye). Fractures in this region, such as those involving the nasal complex or Le Fort 2/3 fractures, can disrupt the nasolacrimal duct, leading to epiphora. In contrast, zygomatic complex fractures do not directly impact the tear drainage system.

**Why Each Wrong Option is Incorrect**
**Option A:** Lefort 2 fractures involve the midface, including the nasal bones and the lacrimal apparatus, which can lead to epiphora due to disruption of the tear drainage system.

**Option C:** Lefort 3 fractures are the most severe and involve the entire midface, including the lacrimal apparatus, making them a common cause of epiphora.

**Option D:** Nasal complex fractures can also lead to epiphora by damaging the nasolacrimal duct and disrupting the tear drainage system.

**Clinical Pearl / High-Yield Fact**
When assessing patients with facial trauma, it's essential to consider the potential impact on the tear drainage system, particularly in cases involving midface fractures. A high index of suspicion for epiphora is crucial in these patients to prevent complications and ensure timely intervention.

**✓ Correct Answer: B. Zygomatic complex fracture.**