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
Antimicrobials effective against anaerobic bacteria include the following except 
Select and explain. 
A. Tobramycin, B. Clindamycin, C. Chloramphenicol, D. Metronidazole
A: Tobramycin
Answer: A: Tobramycin 
Explanation: Ref-KDT 6/e p719,720 Aminoglycoside require oxygen for transpo in the bacterial cell. This hardware for ineffective against anaerobic organism