This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': "Naegler's reaction is used for: \nSelect and explain. \nA. Cl. Tetani, B. Cl. Botulinum, C. Cl. Perfringens, D. Cl. Septicum", 'role': 'user'}, {'content': "Answer: C \nExplanation: Nagler's reaction Nagler's reaction is an example of Neutralization test done for detection of a toxin (lecithinase) produced by C. perfringens. The alpha toxin of C. perfringens has phospholipase activity , when grown on a medium containing egg yolk phospholipid, the organism can break this insoluble triglyceride. Phosphoryl choline release is seen as an area of opacity around the bacterial colonies. Antitoxin can inhibit a positive Nagler's response.", 'role': 'assistant'}]