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
Colonies of M. tuberculosis appear in about 
Select and explain. 
A. 2 days, B. 2-8 weeks, C. 3-4 months, D. 7 days
B: 2-8 weeks
Answer: B: 2-8 weeks 
Explanation: → Generation time : 14-15 hours.
→ Colonies appear in about 2 weeks (may take upto 8 weeks).
→ 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).
→ Solid medium ⇒ Most widely employed for routine culture is Lowenstein-Jensen (LJ) medium without starch.