<prompt> Which of the following streptococcal antigen cross reacts with synol fluid?Carbohydrate group ACell wall proteinCapsular hyaluronic acidPeptidoglycan  <response>: Antigens cross reactivity between Streptococcus antigens and the corresponding human antigen Streptococcal component Human tissue Capsular hyaluronic acid Synol fluid Cell wall protein Myocardium Group A carbohydrate Cardiac valves Cytoplasmic membrane antigen Vascular intima Peptidoglycans Skin antigens 