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: Pathology
Nagglers reaction is used in the diagnosis of: 
Select and explain. 
A. Malaria., B. Whooping cough., C. Gas gangrene., D. Wool sorters disease.
C: Gas gangrene.
Answer: C: Gas gangrene. 
Explanation: Naggler's reaction is given by alpha toxin of "Clostridium perfringens".