This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Fk-506 is a - 
Select and explain. 
A. It is a macrolide antibiotic, B. Immunoglobulin antibody, C. Non depolarising muscle relaxant, D. Opioid analgesic
A: It is a macrolide antibiotic
Answer: A: It is a macrolide antibiotic 
Explanation: 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.