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': 'Which of the following is active against atypical mycobacteria - \nSelect and explain. \nA. Clarithromycin, B. Rifabutin, C. Ciprofloxacin, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' All of the above Regimen for MAC infection o Intensive phase (2-6 months) --> Clarithromycin/Azithromycin + ethambutol + rifabutin + one FQ (ciprofloxacin)/ clofazimine. o Maintenance phase (12 months) -4 Clarithromycin/ azithromycin + ethambutol/one FQ/rifabutin.", 'role': 'assistant'}]