This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Wrong about Corynebacterium diphtheriae 
Select and explain. 
A. Toxin production is chromosome mediated, B. Damage is by toxin production, C. Toxic to hea and neurons, D. More common in children
A: Toxin production is chromosome mediated
Answer: A: Toxin production is chromosome mediated 
Explanation: C. diphtheriae virulence is mediated by its toxin which is produces by tox gene of DNA of Corynephage (bacteriophage).