This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
The following statements are true regarding Clostridium perfringens except 
Select and explain. 
A. It is the commonest cause of gas gangrene, B. It is normally present in human faeces, C. The principal toxin of Clostridium perfringens is the alpha toxin, D. Gas gangrene producing strains of Clostridium Perfringes produce heat resistant spores
D: Gas gangrene producing strains of Clostridium Perfringes produce heat resistant spores
Answer: D: Gas gangrene producing strains of Clostridium Perfringes produce heat resistant spores 
Explanation: Spores are usually destroyed within five minutes by boiling but those of the food poisoning strains of type A and ceain type C strains resist boiling for 1-3 hours. Autoclaving at 121 deg for 15 min is lethal. Spores are resistant to the antiseptics and disinfectants in common use. C.perfringens is the predominant agent causing gas gangrene. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 258