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What is certain strains of Streptococcus mutans
a have been proved to be the cause of human dental caries by means of control studies
b depend for their cariogenicity on the production of insoluble polysaccharides
c cause dental caries by the production of lactic and other acids from fermentation of sugar
d are a cause of infective endocarditis
e Will induce smooth surface caries in quotes and explain in detail?
Strep. mutans may be an important organism but not the only one, but controlled studies in humans cannot conceivably be carried out