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': 'DOC for Trichomonas vaginalis ? \nSelect and explain. \nA. Metronidazole, B. Ampicillin, C. Cotrimoxazole, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Simultaneous treatment of both paners is recommended as it is an STD. Metronidazole 2 g orally as a single dose or 500 mg orally twice a day for 7 days is the drug of choice. In patients not responding to treatment with standard regime, the dose of metronidazole may be increased or it may be administered parenterally. In pregnancy, metronidazole is safe in 2nd and 3rd trimesters.', 'role': 'assistant'}]