To solve the problem, we need to identify the cause of Trichomoniasis.
1. Understanding Trichomoniasis:
Trichomoniasis is a sexually transmitted infection (STI) caused by a protozoan parasite called *Trichomonas vaginalis*. It is not caused by bacteria, fungi, or viruses.
2. Analyzing the Options:
Let's evaluate each option to determine the correct cause:
3. Conclusion:
Trichomoniasis is caused by a protozoan parasite.
Final Answer:
The correct answer is (C) Protozoan.