<prompt> Fk-506 is a -It is a macrolide antibioticImmunoglobulin antibodyNon depolarising muscle relaxantOpioid analgesic  <response>: Ans. is a i.e., It is a macrolide antibiotic o Fk-506 is commonly known as Tacrolimus. o Tacrolimus is a macrolide antibiotic produced by streptomyces tsukubaensis. 