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': 'Niacin is required for growth of - Oxidase \nSelect and explain. \nA. M. tuberculosis, B. M. kansasii, C. M. Scrofuloderma, D. M. Avium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., M. tuberculosis", 'role': 'assistant'}]