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 component of Strep. Pyogenes has cross reactivity to Synovium of Human tissues? \nSelect and explain. \nA. Capsular Hyaluronic Acid, B. Cell wall protein, C. Group A carbohydrate Antigen, D. Peptidoglycan', 'role': 'user'}, {'content': "Answer: A \nExplanation: Capsular Hyaluronic acid from streptococcus pyogenes always cross-reacts with human synol fluid and not with cell wall protein, group A carbohydrate antigen and peptidoglycan. Ref: Textbook of Microbiology By Ananthanarayan, 7th Edition, Pages 205, 207; Lippincott's Illustrated Reviews: Pharmacology, 2nd Edition, Pages 80, 81", 'role': 'assistant'}]