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: Dental
[{'content': 'Not significant in pathogenicity of periodotic problems? \nSelect and explain. \nA. Endotoxins from live bacteria, B. Endotoxins from dead bacteria, C. Microbial interactions, D. Enzyme by microbes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]