Which of the following reproductive structure is divided into cortex and medulla ?

Options

A. Uterus
B. Placenta
C. Oviduct
D. Ovary

Answer

To solve the question "Which of the following reproductive structures is divided into cortex and medulla?", we can follow these steps:

### Step 1: Understand the Terms
- **Cortex**: The outer layer of an organ.
- **Medulla**: The inner region of an organ.

### Step 2: Analyze the Options
The options given are:
1. Uterus
2. Placenta
3. Oviduct
4. Ovary

### Step 3: Evaluate Each Structure
- **Uterus**: The uterus is a single inverted pear-shaped organ with three layers (outer layer, middle smooth muscle layer, and innermost endometrium). It does not have a cortex and medulla division.

- **Placenta**: The placenta is a temporary organ that connects the fetus to the uterine wall. It is not divided into cortex and medulla.

- **Oviduct**: The oviduct (or fallopian tube) is a tubular structure where fertilization occurs. It does not have a cortex and medulla division.

- **Ovary**: The ovary is the primary female reproductive organ. It has a structure that can be divided into two parts: the outer cortex (where egg formation occurs) and the inner medulla (which contains blood vessels and connective tissue).

### Step 4: Conclusion
Based on the analysis, the only reproductive structure that is divided into cortex and medulla is the **ovary**.

### Final Answer
**Ovary** (Option D)

---