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
Catalase negative beta hemolytic streptacocci is - 
Select and explain. 
A. Str. pneumoniae, B. Str. pyogenes, C. Str. aglactiae, D. Enterococcus
B: Str. pyogenes
Answer: B: Str. pyogenes 
Explanation: Ans. is 'b' i.e., Str. pyogenes