The sudden increase in which of the following hormone is directly responsible for the release of ovum from the Graafian follicle ?

Options

A. LH
B. FSH
C. Estrogen
D. Progesterone

Answer

To solve the question regarding which hormone is directly responsible for the release of the ovum from the Graafian follicle, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding the Graafian Follicle**: The Graafian follicle is a mature ovarian follicle that contains an oocyte (immature egg). The process of releasing the ovum is known as ovulation.

2. **Identifying Key Hormones**: The main hormones involved in the regulation of the menstrual cycle and ovulation are:
- Luteinizing Hormone (LH)
- Follicle Stimulating Hormone (FSH)
- Estrogen
- Progesterone

3. **Role of Luteinizing Hormone (LH)**: LH is crucial for triggering ovulation. A surge in LH levels leads to the rupture of the Graafian follicle, resulting in the release of the ovum.

4. **Role of Other Hormones**:
- **Follicle Stimulating Hormone (FSH)**: Primarily responsible for the growth and maturation of ovarian follicles, not the release of the ovum.
- **Estrogen**: While it plays a role in the menstrual cycle and prepares the uterine lining, it does not directly cause ovulation.
- **Progesterone**: Secreted after ovulation to prepare the uterus for potential implantation; it does not trigger ovulation.

5. **Conclusion**: Based on the function of these hormones, the sudden increase in Luteinizing Hormone (LH) is directly responsible for the release of the ovum from the Graafian follicle.

### Final Answer:
The correct answer is **Luteinizing Hormone (LH)**.