11. Clostridium botulinum food poisoning is due to

A. invasion of bacteria in the intestine
B. preformed toxin
C. both (a) and (b)
D. none of the above

12. Drumstick appearance is characteristic of

A. C tetanomorphum
B. C tetani
C. C sphenoides
D. all of these

13. Blackening of meat in cooked meat broth is through

A. C histolyticum
B. C perfringens
C. C tetani
D. all of these

14. Typical drumstick appearance of bacilli is generally seen in

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

15. Which of the following(s) is/are obligate anaeorbes?

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