This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rheumatic Fever, Subject name: Pathology
[{'content': 'Causative organism of rheumatic fever - \nSelect and explain. \nA. Group A Streptococci, B. Staphylococci, C. Group B Streptococci, D. Group D Streptococci', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Group A Streptococci Rheumatic fevero Rheumatic fever (RF) is an acute, inununologically mediated, multisystem inflammatory disease classically occurring a few weeks after an episode of group A streptococcal pharyngitis; occasionally, RF can follow streptococcal infections at other sites, such as the skin.", 'role': 'assistant'}]