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
[{'content': 'LANCEFIELD grouping of streptococci is done using- \nSelect and explain. \nA. M protein, B. Group C peptidoglycan, C. Group C Carbo hydrate antigen, D. Staining properties', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]