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 type of : \nSelect and explain. \nA. Immunoglobulin antibody, B. Non-depolarizing muscle relaxant, C. Macrolide antibiotic, D. Opioid anaesthetic', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tacrolimus is also known as FK-506. It is an immunosuppressant macrolide antibiotic produced by Streptomyces tsukubaensis.\nMuromonab CD3 is also known as OKT3. It is a monoclonal antibody against CD3 cells.', 'role': 'assistant'}]