This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clostridium, Subject name: Microbiology
[{'content': "Naegler's reaction is shown by? \nSelect and explain. \nA. Clostradium tetani, B. Clostridium welchii, C. Mycobacterium tuberculosis, D. Mycobacterium leprae", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Clostridium welchiiRef: Ananthnarayan 7/e / 238', 'role': 'assistant'}]