This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious Disease, Subject name: Pathology
[{'content': 'Streptococcal cross reactivity affects which organ? \nSelect and explain. \nA. Heart, B. Skin, C. Joint, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. All of the above * Non-supporative complications are due to antigenic cross-reactivity of streptococcal antigenic component with human tissues. This antigen cross reactivity is resoponsible for the production of cross reacting antibodies, i.e. antibodies are formed against streptococcal antigens but they damage host tissue antigens because of similarity between streptococcal antigens and human tissue antigens - antigenic cross reactivity.Streptococcal componentHuman tissueCapsular hyaluronic acidSynovial fluidCell wall proteinMyocardiumGroup A carbohydrateCardiac valvesCytoplasmic membrane antigenVascular intimaPeptidoglycansSkin antigens", 'role': 'assistant'}]