Tertiary follicle is characterized by

Options

A. By the presence of fluid filled cavity called antrum
B. By the presence ovule in an ovary
C. By the presence of sperm in fallopian tube
D. By the presence of graafian follide

Answer

To answer the question "Tertiary follicle is characterized by," we will analyze the options provided and determine which one correctly describes the characteristics of a tertiary follicle.

### Step-by-Step Solution:

1. **Understanding Follicle Development**:
- The development of ovarian follicles occurs in stages: primary follicle → secondary follicle → tertiary follicle (also known as the Graafian follicle).
- Each stage has distinct characteristics.

2. **Identifying the Characteristics of Tertiary Follicle**:
- The tertiary follicle is the mature stage of follicle development.
- It is characterized by the presence of a fluid-filled cavity known as the antrum.

3. **Evaluating the Options**:
- **Option A**: Presence of fluid-filled cavity called antrum.
- This is correct. The antrum is a key feature of the tertiary follicle.
- **Option B**: Presence of ovule in an ovary.
- This is incorrect. While the ovule is present in the ovary, it does not specifically characterize the tertiary follicle.
- **Option C**: Presence of sperm in fallopian tube.
- This is incorrect. The presence of sperm is unrelated to the characteristics of a tertiary follicle.
- **Option D**: Presence of Graafian follicle.
- This is incorrect as well since the Graafian follicle is another name for the tertiary follicle itself.

4. **Conclusion**:
- The correct answer is **Option A**: The presence of a fluid-filled cavity called antrum characterizes the tertiary follicle.

### Final Answer:
**The tertiary follicle is characterized by the presence of a fluid-filled cavity called antrum.**