<prompt> Bacitracin sensitivity is used to differentiate -Group A streptococcus from staphylococcusGroup A streptococcus from other Beta hymolytic streptococciGroup A streptococcus from Gamma hemolytic streptococci.Group A streptococcus from Alpha hemolytic streptocci  <response>: 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. 