<prompt> Lance field grouping of streptococci is done by using :M proteinGroup C peptidoglycan cell wallGroup C carbohydrate antigenM antigen  <response>: Lancefield classificationClassification of β hemolytic streptococci into Group A to V except I, J on the basis of group specific C carbohydrate.Griffith classificationSerological typing of Group A Streptococcus pyogenes on the basis of M proteins into types 1, 2, 3 etc.Group C CarohydratePresent in middle layer of cell wall.This antigen is an integral part of cell wall.Serological grouping of streptococci depend on C carbohydrate for which it has to be extracted from cell wall. 