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
True about corynebacterium diphtheriae is all except- 
Select and explain. 
A. Deep invasion is not seen, B. Elek's test is done for toxigenicity, C. Metachromatic granules are seen, D. Toxigenicity is mediated by chromosomal change
D: Toxigenicity is mediated by chromosomal change
Answer: D: Toxigenicity is mediated by chromosomal change 
Explanation: None