**Core Concept**
Malignant melanoma of the eye is a type of cancer that arises from the pigment-producing cells of the uvea, the middle layer of the eye. It has a high propensity for metastasis, which is the spread of cancer cells to distant sites in the body.

**Why the Correct Answer is Right**
The most common site of distant metastasis in intraorbital malignant melanoma is the liver. This is because the liver is the first filter for the blood coming from the eye and is richly vascularized, allowing cancer cells to easily lodge and proliferate. The liver's role in filtering the blood, combined with its high blood flow, makes it an ideal site for metastasis in intraorbital malignant melanoma.

**Why Each Wrong Option is Incorrect**
**Option A:** Brain metastasis is less common than liver metastasis in intraorbital malignant melanoma.
**Option B:** Lung metastasis can occur, but it is less common than liver metastasis in this context.
**Option C:** Bone metastasis is not a typical site for distant metastasis in intraorbital malignant melanoma.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that intraorbital malignant melanoma has a high propensity for metastasis, particularly to the liver, and should be aggressively treated with wide local excision and adjuvant therapy.

**Correct Answer: C. Brain metastasis is less common than liver metastasis in intraorbital malignant melanoma.