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
Neutrilization test is 
Select and explain. 
A. Widal test, B. Weil-Felix test, C. Paul Bunnel test, D. Nagler reaction
D: Nagler reaction
Answer: D: Nagler reaction 
Explanation: Ans. is `d' i.e., Nagler reaction Neutralization reaction When antibody reacts with a toxin or other biologically active antigen, it may neutralize the effect of toxin or antigen. This ability to used in neutralization test. Neutralization tests are of two types