A) poisons released by a living bacterial cells into host tissues
B) poisons released by a dead bacterial cells into host tissues
C) poisons released by virus into host tissues
D) None of the above
Correct Answer: A
Solution :
Toxins (poisons) released by causative agent of diphtheria Coynebacterium diphtheriae is responsible to cause diphtheria. Actually bacterial cell do not contain gene for toxin production-a phage carries the gene for it. Only those lysogenised cells of C-diphtheriae, which carry B-phage, can produce the toxin and cause diphtheria.
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