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': 'Catalase negative beta hemolytic streptococci is - \nSelect and explain. \nA. Str. pneumoniae, B. Str. pyogenes, C. Str. agalactiae, D. Enterococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]