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: Anaesthesia
[{'content': 'Lancefield grouping of streptococci is done by using? \nSelect and explain. \nA. M Protein, B. Group C peptidoglycan cell wall, C. Group C carbobydrate antigen, D. Staining propeies', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Group C carbohydrate antigen", 'role': 'assistant'}]