The thyroid gland is composed of

Options

A. follicles
B. stromal tissue
C. trachea
D. Both (1) and (2)

Answer

### Step-by-Step Solution:

1. **Identify the Structure of the Thyroid Gland**: The thyroid gland is an endocrine gland located in the neck, and it plays a crucial role in regulating metabolism through hormone production.

2. **Understand the Composition**: The thyroid gland is primarily composed of two types of cells:
- **Follicular Cells**: These cells are responsible for the production of thyroid hormones, namely thyroxine (T4) and triiodothyronine (T3).
- **Para Follicular Cells (C Cells)**: These cells produce calcitonin, a hormone involved in calcium homeostasis.

3. **Evaluate the Options**: The options provided are:
- A) Follicles
- B) Stromal tissue
- C) Trachea
- D) Both A and B

4. **Determine the Correct Answer**: Since the question specifically asks about the composition of the thyroid gland, the most relevant option is:
- **Follicles** (which refers to the follicular cells). The other options (stromal tissue and trachea) are not components of the thyroid gland itself.

5. **Conclusion**: Therefore, the thyroid gland is composed of **follicular cells** (option A).