Select the correct statement regarding the menstrual cycle .

Options

A. A rapid secretion of FSH leads to the rupture of the Graafian follicle and the ovum is released
B. Estrogen secreted by the corpus luteum is necessary for the maintenance of the endometrium.
C. During the follicular phase , the primary follicles change into the Graafian follicle, which is transformed into corpus luteum post ovulation.
D. All of the above

Answer

To solve the question regarding the correct statement about the menstrual cycle, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Evaluate the First Statement**:
- The first statement claims that "rapid secretion of FSH leads to rupture of graphene follicle and ovum is released."
- **Analysis**: Follicle Stimulating Hormone (FSH) is primarily involved in the growth and maturation of ovarian follicles. However, the rupture of the Graafian follicle and the release of the ovum (ovulation) is primarily triggered by a surge in Luteinizing Hormone (LH), not FSH.
- **Conclusion**: This statement is **incorrect**.

2. **Evaluate the Second Statement**:
- The second statement states that "Estrogen secreted by Corpus Luteum is necessary for maintenance of Endometrium."
- **Analysis**: The corpus luteum primarily secretes progesterone, which is crucial for maintaining the endometrium (the uterine lining) after ovulation. Estrogen is produced by the follicles and plays a role in the earlier phases of the menstrual cycle.
- **Conclusion**: This statement is also **incorrect**.

3. **Evaluate the Third Statement**:
- The third statement says, "during the follicular phase primary follicle changes to graphene follicle which is in turn transformed to corpus luteum after post ovulation."
- **Analysis**: This statement accurately describes the process of follicular development. The primary follicle develops into a secondary follicle, then into a tertiary (Graafian) follicle, and after ovulation, the remnants of the Graafian follicle transform into the corpus luteum.
- **Conclusion**: This statement is **correct**.

4. **Final Answer**:
- Based on the evaluations, the correct statement regarding the menstrual cycle is the **third statement**.