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': 'Which of the following mycobacteria can cause disease in HIV+ve patient with a CD4 count of 600/ cu.mm? \nSelect and explain. \nA. M. tuberculosis, B. MAC, C. M. chelonei, D. M. fouitum', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., M. Tuberculosis . MAC infection occurs when CD4 + T cells counts are < 50/ml, in contrast M. tuberculosis infection develops early in the course with CD4 T cells counts > 300/ml.", 'role': 'assistant'}]