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': 'The lactoperoxidase thiocynate system present in saliva is against \nSelect and explain. \nA. A. actinomycetemcomitans, B. Streptococcus, C. P. gingivalis, D. Actinomyces', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]