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': 'Colonies of M. tuberculosis appear in about \nSelect and explain. \nA. 2 days, B. 2-8 weeks, C. 3-4 months, D. 7 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: → Generation time : 14-15 hours.\n→ Colonies appear in about 2 weeks (may take upto 8 weeks).\n→ Grows luxuriantly in culture (Eugonic) and addition of 0.5% glycerol improves its growth but it has no effect on M.Bovis, which is dysgonic (Grows sparsely).\n→ Solid medium ⇒ Most widely employed for routine culture is Lowenstein-Jensen (LJ) medium without starch.', 'role': 'assistant'}]