All of the following are characteristic of Corynebacterium diphtheriae EXCEPT:
A. Avirulent strains acquire their virulence factors from virulent strain through lysogenic phages.
B. Avirulent strains acquire their virulence factors from virulent strain through plasmids.
C. It produces a single "A-B"exotoxin that inhibits eukaryotic protein synthesis.
D. Gram-positive club-shaped rods with metachromatic granules.
E. Humans are the only known reservoir.
Answer: B. Avirulent strains acquire their virulence factors from virulent strain through plasmids.
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