This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Regarding Clostridium perfringens gas gangrene, false is - 
Select and explain. 
A. Common cause of gas gangrene, B. Nagler reaction positive, C. Most common toxin is hyaluronidase, D. Food poisoning strain of Cl. perfringens produces heat resistant spores
C: Most common toxin is hyaluronidase
Answer: C: Most common toxin is hyaluronidase 
Explanation: Ans. is. 'c' i.e., Most common toxin is hyalronidase . The most common and most impoant toxin produced by CL perfringensis a- toxin (lecithinase). Clostridium perfringens food poisoning . Some strains of type A Cl. perfringens produce poisoning. They are characterised by the marked heat resistance of their spores and the feeble production of alpha and theta toxins. . Food poisoning is due to production of heat labile enterotoxin. . The food sources primarily involved are meat, meat products and poultry. . Incubation period is 8-24 hours. . Nausea, diarrhea and epigastric pain are the usual symptoms. Fever and vomiting are uncommon.