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': "Elek's gel precipitation test is seen in ? \nSelect and explain. \nA. Clostridium, B. Corynebacterium, C. Bacteroides, D. Campylobacter", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]