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, B. Cell wall protein, C. Capsular hyaluronic acid, D. Peptidoglycan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyaluronan (hyaluronic acid) is a naturally occurring polysaccharide, which is present in extracellular matrices, the synovial fluid of joints, and scaffolding that comprises cartilage.\nHyaluronidase:\xa0\n\nThe enzyme is produced by S. pyogenes as well as by other groups like B, C, G streptococci, Streptococcus suis, Streptococcus anginosus, and S. pneumoniae.\xa0\nThe enzyme splits hyaluronic acid present in host connective tissue, thereby facilitating spread of the bacteria through tissues. The enzyme is antigenic.\n\nParija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:186', 'role': 'assistant'}]