Microbiology All the following are false regarding C. diphteriae toxin EXCEPT: A It is an endotoxin B Toxin production depends on optimum concentration of iron C It acts by activating adenyl cyclase D Schick Test demonstrates circulating toxin 💡 Explanation All the following are false regarding C. diphteriae toxin EXCEPT: ✓ Correct Answer: B. Toxin production depends on optimum concentration of iron