The Lancefield grouping system
A. depends on serological detection of polysaccharide and teichoic acid antigens and is used to identify ?-hemolytic streptococci.
B. is used to identify ?-hemolytic streptococci.
C. is based on a DNA fingerprinting assay specific for streptococci.
D. depends on serological detection of polysaccharide and teichoic acid antigens.
Answer: A
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