Which of the following is not a secondary reproductive organ?

Options

A. Fallopian tube
B. Uterus
C. Ovary
D. Vagina

Explanation

To determine which of the following is not a secondary reproductive organ, we need to identify the primary and secondary reproductive organs in the female reproductive system.

### Step-by-Step Solution:

1. **Understand the Types of Reproductive Organs**:
- **Primary Reproductive Organs**: These are the organs that produce gametes (sex cells). In females, the primary reproductive organ is the ovary, which produces eggs (ova).
- **Secondary Reproductive Organs**: These are the organs that support the reproductive process but do not produce gametes. They include structures like the uterus, fallopian tubes, and vagina.

2. **Identify the Options**:
- The options given are:
- Fallopian tube
- Uterus
- Ovary
- Vagina

3. **Classify Each Organ**:
- **Ovary**: This is the primary reproductive organ in females as it produces eggs.
- **Fallopian Tube**: This is a secondary reproductive organ that transports the egg from the ovary to the uterus.
- **Uterus**: This is also a secondary reproductive organ where the fertilized egg implants and develops.
- **Vagina**: This is another secondary reproductive organ that serves as the birth canal and receives the sperm during mating.

4. **Conclusion**:
- Since the ovary is responsible for the production of eggs, it is classified as a primary reproductive organ. The other options (fallopian tube, uterus, and vagina) are all secondary reproductive organs.

Thus, the answer to the question "Which of the following is not a secondary reproductive organ?" is **Ovary**.