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
Patients suffering from multidrug-resistant tuberculosis can be treated with all the following drugs EXCEPT : 
Select and explain. 
A. Tobramycin, B. Amikacin, C. Ciprofloxacin, D. Clarithromycin
A: Tobramycin
Answer: A: Tobramycin 
Explanation: Aminoglycosides effective in MDR tuberculosis are amikacin, kanamycin and capreomycin, Tobramycin is not effective against mycobacterium.
Ciprofloxacin and clarithromycin are also useful for tuberculosis.