<prompt> Lancefield grouping of streptococci is done by using-M ProteinGroup C peptidoglycan cell wallGroup C carbohydrate antigenStaining properties  <response>: β hemolytic Streptococcus is classified to group A-V based on C carbohydrate antigen Lancefield classificationM protein is used to further classify group A Streptococcus Griffith typing.Ref: Apurba Sastrys Essentials of Medical Microbiology 1e p221, Ananthanarayan 9e p209 