This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Antimicrobials effective against anaerobic bacteria include the following except \nSelect and explain. \nA. Tobramycin, B. Clindamycin, C. Chloramphenicol, D. Metronidazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref-KDT 6/e p719,720 Aminoglycoside require oxygen for transpo in the bacterial cell. This hardware for ineffective against anaerobic organism', 'role': 'assistant'}]