This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
LANCEFIELD grouping of streptococci is done using- 
Select and explain. 
A. M protein, B. Group C peptidoglycan, C. Group C Carbo hydrate antigen, D. Staining properties
C: Group C Carbo hydrate antigen
Answer: C: Group C Carbo hydrate antigen 
Explanation: None