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': 'True regarding mycobacterium tuberculosis is - \nSelect and explain. \nA. Produces visible colonies in 1 weeks time on Lowenstein-Jensen media, B. Decolorised by 20% sulfuric acid, C. Facultative aerobe, D. Niacin positive', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]