Antibiotic used to for sensitivity in identification of streptococcus pyogenes?
Ans. is 'a' i.e., Bacitracin Senstivity to bacitracin is employed as a convenient method for differentiating str. pyogenes from other hemolytic streptococci (Maxted's observation).
Bacitracin
Novobiocin
Penicillin
Optochin