The function of ACTH is to

Options

A. stimulate adrenal medulla
B. stimulate adrenal cortex to produce hormones
C. stimulate pituitary
D. all of these

Answer

### Step-by-Step Solution:

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

2. **Function of ACTH**: The primary function of ACTH is to stimulate the adrenal cortex, which is the outer part of the adrenal glands, to produce and release steroid hormones, particularly cortisol.

3. **Analyzing the Options**:
- **Option A**: Stimulate Adrenal Medulla - This is incorrect because ACTH primarily affects the adrenal cortex, not the medulla.
- **Option B**: Stimulate Adrenal Cortex to produce hormones - This is correct as ACTH stimulates the adrenal cortex to produce hormones like cortisol.
- **Option C**: Stimulate Pituitary - This is incorrect because ACTH is produced by the pituitary gland; it does not stimulate it.
- **Option D**: All of these - This is incorrect since only option B is correct.

4. **Conclusion**: Based on the analysis, the correct answer is **Option B**, which states that ACTH stimulates the adrenal cortex to produce hormones.