In lactational amenorrhoea, there is no ovulation or menstruation during the period of intense lactation following parturition, due to high level of protactin, which?

Options

A. Inhibits the releases of gonadotropins
B. Inhibits the releases of estrogen and progesterone
C. Stimulate the release of FSH and LH
D. Stimualates the release of estrogen and progesterone.

Answer

To solve the question regarding lactational amenorrhea and the role of prolactin, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lactational Amenorrhea**:
- Lactational amenorrhea is a natural form of contraception that occurs during the period of intense breastfeeding after childbirth. During this time, women typically do not experience ovulation or menstruation.

2. **Role of Prolactin**:
- Prolactin is a hormone that is secreted in high amounts during breastfeeding. Its primary function is to stimulate milk production in the mammary glands.

3. **Effect of High Prolactin Levels**:
- The high levels of prolactin during intense lactation have a significant impact on the reproductive hormones. Specifically, prolactin inhibits the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus.

4. **Impact on Gonadotropins**:
- Since GnRH is responsible for stimulating the release of gonadotropins (FSH and LH) from the pituitary gland, the inhibition of GnRH leads to a decrease in the secretion of these hormones. This results in the suppression of ovarian activity, preventing ovulation and menstruation.

5. **Analyzing the Options**:
- **Option A**: Inhibits the release of gonadotropins - This is correct, as prolactin inhibits GnRH, leading to reduced FSH and LH.
- **Option B**: Inhibits the release of estrogen and progesterone - This is incorrect; prolactin does not directly inhibit these hormones.
- **Option C**: Stimulates the release of FSH and LH - This is incorrect; prolactin does not stimulate these hormones.
- **Option D**: Stimulates the release of estrogen and progesterone - This is also incorrect; prolactin does not have a direct stimulating effect on these hormones.

6. **Conclusion**:
- Based on the analysis, the correct answer is **Option A**: Inhibits the release of gonadotropins.