Largest endocrine gland in humans

Options

A. Liver
B. Thyroid
C. Thymus
D. Pituitary

Answer

### Step-by-Step Solution:

1. **Understanding Endocrine Glands**:
- Endocrine glands are ductless glands that secrete hormones directly into the bloodstream. These hormones then travel to target organs to exert their effects.

2. **Analyzing the Options**:
- The options provided are: Liver, Thyroid, Thymus, and Pituitary.

3. **Evaluating Each Option**:
- **Liver**: Although the liver is the largest gland in the human body, it is not classified as an endocrine gland because it has ducts and performs both endocrine and exocrine functions. Therefore, we can eliminate this option.
- **Thyroid**: The thyroid gland is located in the neck and is indeed an endocrine gland. It is known for producing hormones such as thyroxine, which regulates metabolism. It is larger than the other glands listed.
- **Thymus**: The thymus gland is primarily involved in the immune system and is not as large as the thyroid gland. It is also an endocrine gland but smaller in size.
- **Pituitary**: The pituitary gland is often referred to as the "master gland" due to its role in regulating other endocrine glands, but it is very small, roughly the size of a pea.

4. **Conclusion**:
- After evaluating all options, the thyroid gland is the largest endocrine gland in humans. Therefore, the correct answer to the question is the **Thyroid gland**.