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: Microbiology
[{'content': 'A patient with HIV has diarrhoea with AFB (+)ve organism in stool. The most likely organism is ? \nSelect and explain. \nA. Mycobacterium avium intracellulare, B. Mycobacterium TB, C. Mycobacterium leprae, D. Mycoplasma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Mycobacterium avium intracellulare . MAC infection is a late complication of HIV infection, occurs when CD4 < 50/ml, in contrast to T.B. which occurs early even with CD4>300/m1 . Clinical features - Disseminated disease with fever, weight loss and night sweats (most common) - Abdominal pain - Diarrhoea - Lymphadenopathy . Diagnosis is made by demonstration of AFB positive mycobacteria in sputum, stool, blood or bone narrow.", 'role': 'assistant'}]