This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'Trichomonas is seen under microscope in? \nSelect and explain. \nA. Normal saline, B. Distilled water, C. KOH, D. Dextrose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trichomonas exist only is trophozoite form, so seen in normal saline. Vaginal or urethral discharge is examined microscopically in saline wet mount preparation to look for characteristic jerky & twitching motility & shape.', 'role': 'assistant'}]