## **Core Concept**
Multiple Endocrine Neoplasia Type 2A (MEN-2A) is a hereditary syndrome characterized by the occurrence of tumors in multiple endocrine glands. It primarily involves the thyroid, adrenal glands, and parathyroid glands. The syndrome is associated with medullary thyroid carcinoma, pheochromocytoma, and hyperparathyroidism.

## **Why the Correct Answer is Right**
The correct answer, , refers to the fact that MEN-2A includes medullary thyroid carcinoma, pheochromocytoma, and hyperparathyroidism. This combination is a classic description of the syndrome. The other options are not accurate representations of the components of MEN-2A.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent a component of MEN-2A.
- **Option B:** This option is incorrect because it also does not accurately represent a component of MEN-2A.
- **Option D:** This option is incorrect as it is not a characteristic feature of MEN-2A.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl for MEN-2A is that **early prophylactic thyroidectomy is recommended** in patients with RET mutations associated with MEN-2A, given the high penetrance of medullary thyroid carcinoma. This highlights the importance of genetic screening in familial cases.

## **Correct Answer:** .