Which of the following is not a paired structure in male

Options

A. (1) Urethra
B. (2) vas deferens
C. (3) Epididymis
D. (4) Ejaculatory duct

Answer

To determine which of the following structures is not a paired structure in males, we will analyze each option given:

1. **Urethra**: The urethra is a single long tube that serves both the urinary and reproductive systems in males. It is not paired, meaning there is only one urethra.

2. **Vas deferens**: The vas deferens is a paired structure, with one on each side of the male reproductive system. It connects the epididymis to the pelvic region.

3. **Epididymis**: The epididymis is also a paired structure, with one on each side of the testes. Its primary function is the maturation of sperm.

4. **Ejaculatory duct**: The ejaculatory duct is formed by the union of the vas deferens and the duct from the seminal vesicle. There are two ejaculatory ducts, one on each side.

Based on this analysis, the only structure that is not paired is the **urethra**.

### Final Answer:
The structure that is not a paired structure in males is the **urethra**.