This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Bacitracin sensitivity is used to differentiate - 
Select and explain. 
A. Group A streptococcus from staphylococcus, B. Group A streptococcus from other Beta hymolytic streptococci, C. Group A streptococcus from Gamma hemolytic streptococci., D. Group A streptococcus from Alpha hemolytic streptocci
B: Group A streptococcus from other Beta hymolytic streptococci
Answer: B: Group A streptococcus from other Beta hymolytic streptococci 
Explanation: Ans. is 'b' i.e., Group A streptococcus from other Beta hymolytic streptococci o Lets discuss each option one by oneStaphylococci and streptococci are differentiated by catalase test.Bacitracin sensitivity is used to differentiate streptococcus pyogenes (group A streptococcus) from other beta hemolytic streptococci.Alpha hemolytic and Gamma hemolytic streptococci are differentiated from Beta hemolytic streptocci, on the basis ofhemolysis.Following flow chart will help in the diagnosis of gram (+)ve cocci.