Which of the following structure is homologous to penis ?

Options

A. mons pubis
B. labia majora
C. labia minora
D. Clitoris

Answer

To determine which structure is homologous to the penis, we need to understand the concept of homologous structures and their origins.

### Step-by-Step Solution:

1. **Understanding Homologous Structures**:
- Homologous structures are those that have a common evolutionary origin but may serve different functions in adult organisms. They arise from the same embryonic tissues.

2. **Identifying the Structures**:
- The options given are:
- Mons pubis
- Labia majora
- Labia minora
- Clitoris

3. **Analyzing the Options**:
- **Mons Pubis**: This is a fatty tissue covering the pubic bone and does not have a direct homologous relationship with the penis.
- **Labia Majora**: These are the outer folds of skin that protect the vaginal opening, and while they are part of the external female genitalia, they are not homologous to the penis.
- **Labia Minora**: These are the inner folds of skin around the vaginal opening and also do not have a homologous relationship with the penis.
- **Clitoris**: The clitoris is a small organ located at the top of the vulva and is involved in sexual arousal.

4. **Establishing the Homologous Relationship**:
- Both the penis and the clitoris develop from the same embryonic structure known as the genital tubercle. This structure differentiates into either the penis in males or the clitoris in females depending on the presence of androgens during development.

5. **Conclusion**:
- Since the clitoris and the penis share a common origin and have similar anatomical structures, they are considered homologous organs.

### Final Answer:
The structure that is homologous to the penis is the **clitoris** (Option 4).