Which of the following contributes in the formation of seminal plasma?
A. Seminal vesicle.
B. Sertoli ceils.
C. Prostate gland.
D. Vasdeferens.
E. Bulbourethral gland.
F. Preputial gland.

Options

A. A, C, E, F
B. A, B, D, F
C. A, C, E
D. Only C and D

Answer

To determine which of the following contributes to the formation of seminal plasma, we will analyze each option provided:

1. **Seminal Vesicle (Option A)**:
- The seminal vesicle is an accessory reproductive gland that produces a significant portion of seminal plasma. It secretes a fluid rich in fructose, which provides energy for sperm motility.
- **Conclusion**: Yes, it contributes to seminal plasma.

2. **Sertoli Cells (Option B)**:
- Sertoli cells are found within the seminiferous tubules of the testes and are responsible for nourishing developing sperm cells. However, they do not secrete any components of seminal plasma.
- **Conclusion**: No, it does not contribute to seminal plasma.

3. **Prostate Gland (Option C)**:
- The prostate gland is another accessory gland that contributes to seminal plasma. It secretes a fluid that helps to nourish and transport sperm.
- **Conclusion**: Yes, it contributes to seminal plasma.

4. **Vas Deferens (Option D)**:
- The vas deferens is a duct that transports sperm from the epididymis to the ejaculatory duct. It does not produce seminal plasma.
- **Conclusion**: No, it does not contribute to seminal plasma.

5. **Bulbourethral Gland (Option E)**:
- Also known as Cowper's gland, the bulbourethral gland secretes a pre-ejaculate fluid that helps to lubricate the urethra and neutralize acidity. This secretion is part of the seminal plasma.
- **Conclusion**: Yes, it contributes to seminal plasma.

6. **Preputial Gland (Option F)**:
- The preputial gland is not present in humans; it is more commonly found in some rodents. Therefore, it does not contribute to seminal plasma in humans.
- **Conclusion**: No, it does not contribute to seminal plasma.

### Final Answer:
The glands that contribute to the formation of seminal plasma are:
- Seminal Vesicle (A)
- Prostate Gland (C)
- Bulbourethral Gland (E)

Thus, the correct options are A, C, and E.