6. The most toxic exotoxin is

A. tetanus toxin
B. diphtheria toxin
C. botulinum toxin
D. cholera toxin

7. Which of the following species of Clostridium is predominantly saccharolytic?

A. C septicum
B. C perfringens
C. C novyi
D. All of these

8. Stormy clot reaction is useful in the identification of

A. C tetani
B. C botulinum
C. C perfringens
D. C difficile

9. Food poisoning strains of Clostridium perfringens belong to

A. type A
B. type B
C. type C
D. type D

10. Reddening of meat in cooked meat broth is produced by

A. C tetani
B. C histolyticum
C. Clostridium perfringens
D. C sporogenes