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': 'Which of the following streptococcal antigen cross reacts with synovial fluid ? \nSelect and explain. \nA. Carbohydrate (group A), B. Cell wall protein, C. Capsular hyaluronic acid, D. Peptidoglycan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]