Antibiotic used to for sensitivity in identification of streptococcus pyogenes?: (A) Bacitracin, (B) Novobiocin, (C) Penicillin, (D) Optochin
Answer is A. 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).