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
Drugs that can be used to treat infections caused by Bacteroides fragilis are all EXCEPT : 
Select and explain. 
A. Metronidazole, B. Trovafloxacin, C. Vancomycin, D. Amikacin
D: Amikacin
Answer: D: Amikacin 
Explanation: None