Antibiotic gramicidin S is derived from ?: (A) Bacillus brevis, (B) Cl difficle, (C) S epidermidis, (D) Streptococcus bovis
Answer is A. Ans. is'a'i.e., Bacillus brevisGramicidin-s is an antibiotic effective against some Gram positive and Gram negative bacteria as well as some fungi.It is a derivative of gramicidin, produced by the Gram positive bacterium Bacillus brevis.