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': 'Dental caries is caused by - \nSelect and explain. \nA. Streptococcus pyogenes, B. Streptococcus mutans, C. Enterococcus, D. H. influenzae', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Streptococcus mutans . Streptococcus mutans belongs to viridans streptococci and is an impoant cause of dental caries.", 'role': 'assistant'}]