Which of the following organ is a paired structure ?

Options

A. Urethra
B. Prostate
C. Scrotum
D. Ejaculatory duct

Answer

To determine which of the following organs is a paired structure, we will analyze each option provided in the question:

1. **Urethra**: The urethra is a single tube-like structure that carries urine from the bladder to the outside of the body in both males and females. Therefore, it is not a paired structure.

2. **Prostate**: The prostate gland is a single gland located below the bladder in males. It plays a role in the reproductive system by producing fluid that nourishes and transports sperm. Since there is only one prostate gland, it is not a paired structure.

3. **Scrotum**: The scrotum is a pouch-like structure that contains the testicles (testes). While the scrotum itself is a single structure, it houses two testicles, but the scrotum itself is not considered a paired organ.

4. **Ejaculatory Duct**: The ejaculatory duct is formed by the merging of the duct from the seminal vesicle and the vas deferens. There are two ejaculatory ducts in the male reproductive system (one from each side), making it a paired structure.

After analyzing all the options, the correct answer is **D. Ejaculatory Duct**.

### Step-by-Step Solution:
1. Identify each organ listed in the options.
2. Determine whether each organ is a single structure or if there are two of them.
3. Conclude that the urethra, prostate, and scrotum are not paired structures.
4. Confirm that the ejaculatory duct is a paired structure as there are two of them.
5. State the final answer as D. Ejaculatory Duct.