Function of ACTH is to

Options

A. Stimulate pituitary
B. Stimulate the adrenal cortex to produce hormones
C. Suppress the activity of adrenal cortex
D. Stimulate thyroid.

Answer

### Step-by-Step Solution:

1. **Understanding ACTH**: ACTH stands for Adrenocorticotropic Hormone. It is a hormone produced by the anterior pituitary gland.

2. **Location of ACTH Production**: The anterior pituitary gland is a part of the endocrine system and is often referred to as the "master gland" because it regulates various bodily functions by releasing hormones.

3. **Function of ACTH**: The primary function of ACTH is to stimulate the adrenal cortex, which is the outer layer of the adrenal glands located on top of the kidneys.

4. **Response of the Adrenal Cortex**: When ACTH stimulates the adrenal cortex, it triggers the production and release of various hormones, including cortisol, which plays a crucial role in stress response, metabolism, and immune function.

5. **Evaluating Options**:
- Option A (stimulate pituitary) is incorrect because ACTH is produced by the pituitary, not stimulating it.
- Option B (stimulate the adrenal cortex to produce hormones) is correct as it accurately describes the function of ACTH.
- Option C (suppress the activity of adrenal cortex) is incorrect because ACTH activates, not suppresses, the adrenal cortex.
- Option D (stimulate thyroid glands) is incorrect as ACTH does not have a direct role in stimulating the thyroid glands.

6. **Conclusion**: The correct answer is Option B: ACTH stimulates the adrenal cortex to produce hormones.