This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Nagler reaction is type of - 
Select and explain. 
A. Neutrilization reaction is type of -, B. CFT, C. Precipitation, D. Agglutination
A: Neutrilization reaction is type of -
Answer: A: Neutrilization reaction is type of - 
Explanation: Its a neutralization test. Lecithinase test or Nagler's reaction is a biochemical test used to identify organisms which liberate phospholipases (lecithinases) e.g. Clostridium perfringens. The alpha (a) toxin of C. perfringens has phospholipase activity and hence, helps in differentiation of C. perfringens from other Clostridium spp that also produce lecithinase (C.baratti, C.absonum, C.bifermantans, C.sordelli and C.novyi) by neutralization of lecithin c activity by an antitoxin. Ref: Ananthanarayan & Panikers textbook of microbiology 9th edition pg:112