The LH and FSH secretion from the anterior pituitary is Stimulated by the

Options

A. gonadotropin releasing hormone .
B. testosterone from testis
C. melatonin from pineal gland
D. thyroxine from thyroid gland

Answer

To solve the question regarding what stimulates the secretion of LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone) from the anterior pituitary, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Hormones**:
- LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone) are both hormones produced by the anterior pituitary gland. They play crucial roles in regulating the reproductive system.

2. **Identifying the Stimulating Factor**:
- The secretion of LH and FSH is primarily regulated by the hypothalamus. The hypothalamus releases a specific hormone that stimulates the anterior pituitary to produce LH and FSH.

3. **Recognizing the Releasing Hormone**:
- The hormone released by the hypothalamus that stimulates the anterior pituitary to secrete LH and FSH is called Gonadotropin-Releasing Hormone (GnRH).

4. **Evaluating the Options**:
- Now, let's evaluate the options given in the question:
- **Option A**: Gonadotropin-Releasing Hormone (GnRH) - This is the correct answer as it stimulates the secretion of LH and FSH.
- **Option B**: Testosterone from testis - This hormone is produced in response to LH and does not stimulate its secretion.
- **Option C**: Melatonin from the pineal gland - This hormone is involved in regulating sleep cycles and does not influence LH and FSH secretion.
- **Option D**: Thyroxine from the thyroid gland - This hormone is regulated by Thyroid Stimulating Hormone (TSH) and does not stimulate LH and FSH secretion.

5. **Conclusion**:
- Based on the evaluation, the correct answer is **Option A: Gonadotropin-Releasing Hormone**.

### Final Answer:
The LH and FSH secretion from the anterior pituitary is stimulated by **Gonadotropin-Releasing Hormone (GnRH)**.