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': 'A 50 year old male suffering from renal failure, underwent kidney transplant. He was prescribed a nucleotide derivative following the organ transplant. The nucleotide derivative of therapeutic impoance in this organ transplant is - \nSelect and explain. \nA. Azathioprine, B. 5-Fluorouracil, C. cytarabine, D. allopurinol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Azathioprine o All of the drugs given in the question are nucleotide analogues. o Out of these drugs only Azathioprine has got significant immunosuppressive propey. So it can be used in the prevention of graft rejection", 'role': 'assistant'}]