This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology Pa 1 (Gram Positive Cocci, Gram Negative Cocci), Subject name: Microbiology
C-carbohydrate in Streptococcus hemolyticus is impoant for- 
Select and explain. 
A. Lancefield classification, B. Phagocytic inhibition, C. Toxin production, D. Haemolysis
A: Lancefield classification
Answer: A: Lancefield classification 
Explanation: Option 1- Hemolytic streptococci are classified by Lancefield serological classification into groups based on nature of 'C' Option 2 - C-Carbohydrate antigen doesn't have any anti-phagocytic role. Option 3- C-Carbohydrate antigen doesn't have any correlation with toxin production. Option 4- On the basis of hemolysis, streptococci can be divided into 3 groups:- a Hemolytic, b Hemolytic, g Hemolytic