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': 'Salivary peroxidise system is known to be effective against \nSelect and explain. \nA. Actinomyces viscosus, B. Lactobacillus acidophilus, C. Streptococcus mutans, D. Veilonella parvula', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]