This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Trichomoniasis is transmitted through which stage 
Select and explain. 
A. Cyst, B. Oocyst, C. Sporozoite, D. Trophozoite
D: Trophozoite
Answer: D: Trophozoite 
Explanation: Trichomonas vaginalis exists only as a trophozoite; no cyst stage has been identified.