## **Core Concept**
The question tests knowledge on the metastatic pattern of intraorbital malignant melanoma, specifically focusing on the most common site of distant metastasis. Malignant melanoma is a highly aggressive tumor known for its rapid progression and potential to metastasize.

## **Why the Correct Answer is Right**
The liver is the most common site for distant metastasis in intraorbital malignant melanoma due to its rich blood supply and the fact that melanoma cells can easily spread through the bloodstream. The liver's role in filtering blood from the gastrointestinal tract and its extensive vascular network make it a prime site for metastatic cells to lodge and proliferate.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While the lungs can be a site for metastasis for various cancers, they are not the most common site for intraorbital malignant melanoma metastasis.
- **Option B:** The brain can be a site for metastasis, especially for certain types of cancers that have a predilection for neural tissue, but it is not the most common site for intraorbital malignant melanoma.
- **Option C:** The skin and soft tissues can host metastases from various primary sites, but they are not the most common sites for distant metastasis of intraorbital malignant melanoma.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that malignant melanoma is notorious for its aggressive behavior and potential for widespread metastasis, making early detection and treatment crucial. The liver's role as a common metastatic site for intraorbital melanoma is critical for follow-up and management planning.

## **Correct Answer:** D. Liver.