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
Role of Malachite green in LJ medium ? 
Select and explain. 
A. Increase growth of M. tuberculosis, B. Inhibits growth of other bacteria, C. Nutritive value, D. As an indicator
B: Inhibits growth of other bacteria
Answer: B: Inhibits growth of other bacteria 
Explanation: Ans. is 'b' i.e., Inhibits growth of other bacteria Lowenstein-Jensen Medium (LJ medium) LJ medium consists of mineral salts, asparagine, glycerol, malachite green and hen's egg. The malachite green prevents the growth of other microorganism on medium. It is used as a primary isolation medium for mycobacteria.