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
[{'content': 'Nagglers reaction is used in the diagnosis of: \nSelect and explain. \nA. Malaria., B. Whooping cough., C. Gas gangrene., D. Wool sorters disease.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Naggler\'s reaction is given by alpha toxin of "Clostridium perfringens".', 'role': 'assistant'}]