All of the following structure are paired in male reproductive system, except :

Options

A. Seminal vesicles and Cowper's gland
B. Prostate gland and urethra
C. Ejaculatory duct and Epididymis
D. Bulbo - urethral gland and Vas deferens

Answer

To solve the question "All of the following structures are paired in the male reproductive system, except:", we will analyze each option provided to identify which structure is unpaired.

### Step-by-Step Solution:

1. **Understanding Paired Structures**: In the male reproductive system, certain structures are paired (meaning there are two of them) while others are unpaired (meaning there is only one).

2. **Evaluating the First Option**:
- **Seminal Vesicles and Corpus Gland**:
- Seminal vesicles are paired structures; there are two of them.
- The corpus gland (likely referring to the corpus spongiosum or corpus cavernosum) is also paired.
- **Conclusion**: This option is incorrect as both structures are paired.

3. **Evaluating the Second Option**:
- **Prostate Gland and Urethra**:
- The prostate gland is an unpaired structure; there is only one prostate gland.
- The urethra is also unpaired; there is only one urethra.
- **Conclusion**: This option is correct as both structures are unpaired.

4. **Evaluating the Third Option**:
- **Ejaculatory Duct and Epididymis**:
- The ejaculatory duct is paired; there are two of them.
- The epididymis is also paired; there are two epididymides.
- **Conclusion**: This option is incorrect as both structures are paired.

5. **Evaluating the Fourth Option**:
- **Bulbo-Urethral Gland and Vas Deferens**:
- The bulbo-urethral glands are paired; there are two of them.
- The vas deferens is also paired; there are two vas deferens.
- **Conclusion**: This option is incorrect as both structures are paired.

### Final Answer:
The correct answer is **Option 2: Prostate gland and Urethra**, as both are unpaired structures in the male reproductive system.