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
Bacitracin sensitive streptococci: 
Select and explain. 
A. Steptococcus agalactiae, B. Streptococcus pyogenes, C. Enterococcus, D. Streptococcus viridans
B: Streptococcus pyogenes
Answer: B: Streptococcus pyogenes 
Explanation: Ans. (b) Streptococcus pyogenes Ref Ananthanarayan 8/e, p 207, 9/e, p 210 "Sensitivity to hacitracin is employed as a convenient method for differentiating Str. pyogenes from other hemolytic streptococci." For details see answer no 20 of chapter 8.