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
[{'content': 'Gastrointestinal enteritis necroticans is caused by- \nSelect and explain. \nA. Clostridium difficile, B. Clostridium perfringens, C. Cl. botulinum, D. C. Jejuni', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]