The endodermal derivatives include

Options

A. Thyroid
B. Pineal gland
C. Spleen
D. Pituitary

Explanation

### Step-by-Step Solution:

1. **Identify the Derivatives of Endoderm**: The question requires us to identify which structures arise from the endoderm layer during embryonic development.

2. **List the Given Options**: The options provided include:
- Thyroid
- Pineal gland
- Spleen
- Pituitary gland

3. **Analyze Each Option**:
- **Thyroid Gland**: The thyroid gland is known to arise from the endoderm. Therefore, it is an endodermal derivative.
- **Pineal Gland**: The pineal gland originates from the ectoderm, not the endoderm.
- **Spleen**: The spleen is derived from the mesoderm, making it a mesodermal derivative.
- **Pituitary Gland**: The pituitary gland also arises from the ectoderm, specifically from the oral ectoderm.

4. **Conclusion**: Based on the analysis, the only structure that arises from the endoderm is the thyroid gland. Therefore, the correct answer is:
- **Thyroid** (Option 1).