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
[{'content': 'Fk-506 is a - \nSelect and explain. \nA. It is a macrolide antibiotic, B. Immunoglobulin antibody, C. Non depolarising muscle relaxant, D. Opioid analgesic', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]