<prompt> Lancefield group of streptococci is based onM proteinsCarbohydrate C antigen on the cell wallBile solubilitySugar fermentation  <response>: Carbohydrate contained in the cell wall of many streptococci forms the basis of serologic grouping into Lancefield groups A-H and K-U. The serologic specificity of the group-specific carbohydrate is determined by an amino sugar.Jawetz 23e pg: 213 