## **Core Concept**
The question pertains to the most common type of tumor affecting the heart. Cardiac tumors can be either primary (originating from the heart) or secondary (metastatic to the heart). Primary cardiac tumors are relatively rare.

## **Why the Correct Answer is Right**
The correct answer, **Myxoma**, is the most common type of primary cardiac tumor in adults. Myxomas account for approximately 50% of all primary cardiac tumors. They are typically benign and most frequently occur in the left atrium. Myxomas are thought to arise from the mesothelial or endothelial cells.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and cannot be evaluated.
- **Option B:** This option is blank and cannot be evaluated.
- **Option C:** This option is blank and cannot be evaluated.
- **Option D:** This option is blank and cannot be evaluated.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that while myxomas are benign, they can cause significant morbidity due to embolization of tumor fragments or associated thrombi. Additionally, myxomas can cause obstructive symptoms depending on their location and size. Familial myxoma is part of the Carney complex, which includes myxomas, endocrine abnormalities, and skin changes.

## **Correct Answer: C. Myxoma**