This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drugs that can be used to treat infections caused by Bacteroides fragilis are all EXCEPT : \nSelect and explain. \nA. Metronidazole, B. Trovafloxacin, C. Vancomycin, D. Amikacin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]