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': 'Commonest mycobacterial infection in patient in tropical countries - \nSelect and explain. \nA. M. Leprae, B. M. avium intracellulare, C. M. tuberculosis, D. M. kansasii', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]