Classification of pathogenic streptococci into group A, B, C, D and G is based on -: (A) Color of colonies on blood agar, (B) Antigenicity of cell wall carbohydrate, (C) Presence or absence of capsule, (D) Presence or absence of M protein
Answer is B. Ans. is 'b' i.e., Antigenicity of cell wall carbohydrate