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': 'Patients suffering from multidrug-resistant tuberculosis can be treated with all the following drugs EXCEPT : \nSelect and explain. \nA. Tobramycin, B. Amikacin, C. Ciprofloxacin, D. Clarithromycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Aminoglycosides effective in MDR tuberculosis are amikacin, kanamycin and capreomycin, Tobramycin is not effective against mycobacterium.\nCiprofloxacin and clarithromycin are also useful for tuberculosis.', 'role': 'assistant'}]