Cancer of parafollicular or C-cells of thyroid is

Options

A. Follicular cancer
B. Medullary cancer
C. Papillary cancer
D. Anaplastic cancer.

Answer

To solve the question regarding the cancer of parafollicular or C-cells of the thyroid, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the type of cancer that originates from the parafollicular or C-cells of the thyroid gland.

2. **Identify the Function of C-cells**: Parafollicular cells, also known as C-cells, are responsible for the secretion of the hormone calcitonin, which helps regulate calcium levels in the blood.

3. **Review the Options**: The options provided are:
- A) Follicular cancer
- B) Medullary cancer
- C) Papillary cancer
- D) Anaplastic cancer

4. **Analyze Each Option**:
- **Follicular Cancer**: This type of cancer arises from the follicular cells of the thyroid, which secrete thyroxine. Therefore, this option is incorrect.
- **Medullary Cancer**: This cancer specifically arises from the parafollicular cells (C-cells) of the thyroid. This option is likely correct.
- **Papillary Cancer**: This is another type of thyroid cancer, but it originates from the follicular cells, not the C-cells. Thus, this option is incorrect.
- **Anaplastic Cancer**: This is a rare and aggressive form of thyroid cancer, but it does not specifically arise from the parafollicular cells. Therefore, this option is also incorrect.

5. **Conclusion**: Based on the analysis, the cancer of the parafollicular or C-cells of the thyroid is **Medullary cancer**. Thus, the correct answer is **Option B**.

### Final Answer:
The cancer of parafollicular or C-cells of the thyroid is **Medullary cancer**.

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