## Core Concept
Medullary thyroid carcinoma (MTC) is a type of thyroid cancer that originates from the parafollicular cells, also known as C cells, which produce calcitonin. Unlike other types of thyroid cancer that arise from follicular cells and can be treated with radioactive iodine, MTC does not respond to radioactive iodine therapy.

## Why the Correct Answer is Right
The treatment for medullary thyroid carcinoma primarily involves **surgical removal** of the tumor. This often includes a total thyroidectomy (removal of the entire thyroid gland) and may involve dissection and removal of lymph nodes in the neck if they are involved. The goal is to remove the cancer completely. Since MTC does not take up radioactive iodine, **radioactive iodine therapy** is not effective.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because while surgery is indeed a component of treatment, specifying it without acknowledging the role of other treatments or the specifics of MTC management could be misleading.
* **Option B:** This option might suggest a treatment that is not applicable for MTC, such as radioactive iodine, which is ineffective for this type of thyroid cancer.
* **Option C:** This could imply a treatment approach not typically used for MTC, such as targeted therapy without specifying the context or effectiveness.
* **Option D:** Assuming this option suggests a less appropriate or ineffective treatment strategy for MTC.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **medullary thyroid carcinoma is associated with elevated calcitonin levels**, which can be used as a tumor marker for diagnosis and follow-up. Additionally, MTC can be part of multiple endocrine neoplasia (MEN) syndromes, specifically MEN 2A and MEN 2B, which also involve pheochromocytoma and hyperparathyroidism.

## Correct Answer Line
**Correct Answer: C. Surgical removal.**