Which of the following hormones is not secreted by the hypothalamus ?

Options

A. Growth hormone - releasing hormone
B. Oxytocin
C. Antidiuretic hormone
D. Follicle stimulating hormone

Answer

To determine which hormone is not secreted by the hypothalamus, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Hypothalamus**: The hypothalamus is a crucial part of the brain that regulates various bodily functions and is known for secreting several important hormones. It plays a key role in the endocrine system by controlling the pituitary gland.

2. **Reviewing the Options**:
- **Option A: Growth Hormone-Releasing Hormone (GHRH)**: This hormone is secreted by the hypothalamus and stimulates the anterior pituitary to release growth hormone (GH). Therefore, this option is secreted by the hypothalamus.

- **Option B: Oxytocin**: Oxytocin is produced in the hypothalamus and released from the posterior pituitary gland. It plays a significant role during childbirth and lactation. Thus, this hormone is also secreted by the hypothalamus.

- **Option C: Antidiuretic Hormone (ADH)**: Like oxytocin, ADH is synthesized in the hypothalamus and released from the posterior pituitary. It regulates water balance in the body. Hence, this hormone is secreted by the hypothalamus as well.

- **Option D: Follicle-Stimulating Hormone (FSH)**: FSH is a hormone that is produced by the anterior pituitary gland, not the hypothalamus. It is involved in reproductive processes, particularly in the regulation of the menstrual cycle and spermatogenesis.

3. **Conclusion**: Based on the analysis of the options, the hormone that is not secreted by the hypothalamus is **Follicle-Stimulating Hormone (FSH)**.

### Final Answer:
The hormone that is not secreted by the hypothalamus is **Follicle-Stimulating Hormone (FSH)**.