This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, 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. Rifamipicin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer KDT 6/e p 750 Treatment of MAC infection is REC ( Rifabutin+Ethambutol+Clarithromycin) Claruthromycin alone used for the prophylaxis of MAC infection in HIV positive patients. Azithromycin can also be used in place for Clarithromycin', 'role': 'assistant'}]