This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Parasitic Drugs, Subject name: Pharmacology
[{'content': 'Metronidazole is LEAST likely to be effective in the treatment of: \nSelect and explain. \nA. Hepatic amoebiasis, B. Infection caused by Bacteroides fragilis, C. Pseudomembranous colitis, D. Pneumocystosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Metronidazole is not used in the treatment of Pneumocystosis Its DOC is trimethoprime sulfomethoxazole (Cotrimoxazole) METRONIDAZOLE G - GIARDIASIS U - PEPTIC ULCER P - PMC T - TRICHOMONIASIS A - ANAEROBIC BACTERIA AMEOBIASIS', 'role': 'assistant'}]