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 drugs is useful in the treatment of infection by Mycobacterium avium complex? \nSelect and explain. \nA. Isoniazid, B. Clarithromycin, C. Cycloserine, D. Rifampicin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment of MAC infection is REC (Rifabutin + Ethambutol + Clarithromycin)\nClarithromycin alone can be used for the prophylaxis of MAC infections in HIV positive patients.\nAzithromycin can also be used in place of clarithromycin.', 'role': 'assistant'}]