Pituitary gland is known as master endocrine gland because it controls

Options

A. Thyroid gland and hence metabolism
B. Gonads as well as adrenals and hence sex, appearance and salt metabolism
C. Growth
D. Thyroid, gonads and adrenals

Answer

### Step-by-Step Solution:

1. **Understanding the Pituitary Gland**: The pituitary gland is often referred to as the "master endocrine gland" because it plays a crucial role in regulating various bodily functions by controlling other endocrine glands.

2. **Identifying the Functions of the Pituitary Gland**: The pituitary gland produces hormones that regulate the functions of other glands such as the thyroid gland, adrenal glands, and gonads (ovaries and testes).

3. **Analyzing the Options**:
- **Option 1**: Thyroid Gland and Metabolism - This option is incorrect because while the pituitary gland influences the thyroid gland, it does not solely control metabolism.
- **Option 2**: Gonads and Adrenals - This option is also incorrect as it does not encompass the full range of glands controlled by the pituitary.
- **Option 3**: Incorrect option - This option does not provide a complete answer.
- **Option 4**: Thyroid, Gonads, and Adrenal - This option is correct because it includes all the major glands that the pituitary gland regulates.

4. **Conclusion**: The correct answer is **Option 4**: Thyroid, Gonads, and Adrenal, as the pituitary gland indeed regulates these glands and is therefore termed the master endocrine gland.