This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Streptococci, Subject name: Microbiology
[{'content': "Causative agent of acute rheumatic fever - \nSelect and explain. \nA. Group 'A' b-hemolytic streptococcus, B. Group-B b-hemolytic streptococcus, C. Group-C b-hemolytic streptococcus, D. Group-D b-hemolytic streptococcus", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Group 'A' p-hemolytic streptococcus o Acute rheumatic fever is caused by streptococcus pyogenes - group-A Beta hemolytic streptococcus.", 'role': 'assistant'}]