Which one of the following is not a male accessory gland?

Options

A. Seminal vesicle
B. Ampulla
C. Prostate
D. Bulbo-urethral gland

Explanation

To determine which of the following is not a male accessory gland, we can analyze each option provided:

1. **Seminal Vesicle**: This is a male accessory gland that produces a significant portion of the fluid that becomes semen. It is involved in nourishing and transporting sperm.

2. **Ampulla**: The ampulla is not a male accessory gland. Instead, it refers to a part of the female reproductive system, specifically a section of the fallopian tubes where fertilization typically occurs. Therefore, it is not involved in male reproductive functions.

3. **Prostate Gland**: This is another male accessory gland that produces fluid that nourishes and protects sperm. It plays a crucial role in semen production.

4. **Bulbo-Urethral Gland**: Also known as Cowper's glands, these are male accessory glands that secrete a pre-ejaculatory fluid that helps to lubricate the urethra and neutralize acidity.

Based on this analysis, the correct answer to the question "Which one of the following is not a male accessory gland?" is:

**B. Ampulla**