**Core Concept**
Raccoon's eye is a clinical sign characterized by periorbital ecchymosis, or bruising around the eyes, resulting from a fracture of the anterior table of the frontal bone or a severe head injury. This condition is often associated with a basal skull fracture.

**Why the Correct Answer is Right**
The ecchymosis in raccoon's eye is due to the leakage of blood from the anterior ethmoidal and frontal sinuses into the soft tissues of the face. This occurs when there is a fracture of the anterior table of the frontal bone, which allows blood to seep into the surrounding tissues. The ecchymosis is typically bilateral, reflecting the symmetry of the frontal bone fracture.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because raccoon's eye is not typically associated with facial fractures other than the anterior table of the frontal bone.
**Option B:** This option is incorrect because raccoon's eye is not a feature of eye injuries or conditions affecting the posterior segment of the eye.
**Option C:** This option is incorrect because raccoon's eye is not a feature of systemic conditions such as bleeding disorders or vitamin deficiencies.

**Clinical Pearl / High-Yield Fact**
Raccoon's eye is a classic sign of a basal skull fracture, and its presence should prompt a thorough evaluation of the patient's head and neck for other signs of trauma.

**Correct Answer: C. Subconjunctival hemorrhage.**