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': 'Streptococci causing dental caries : \nSelect and explain. \nA. Streptococci equisimilis, B. Streptococci mutans, C. Streptococci pneumoniae, D. Streptococci bovis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Strep. mutans:\n\nIt is member of viridans streptococci ( α hemolytic).\nIt assumes bacillary form in acid environment.\nCan synthesize acid and large polysaccharide (adhesive dextran or levan) from sucrose.', 'role': 'assistant'}]