This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Neoplastic Agents, Subject name: Pharmacology
[{'content': 'True about Azathioprine is? \nSelect and explain. \nA. It has more anti tumor effect than immunosuppressant effect, B. It is not a prodrug, C. It selectively affects differentiation of T cells, D. It is a pyramidine antimetabolite', 'role': 'user'}, {'content': "Answer: C \nExplanation: ANSWER: (C) It selectively affects differentiation of T cellsREF: KDT 6th ed p. 840AZATHIOPRINEPurine antimetaboliteMore marked immunosuppressant effect than antitumour effectIt's a prodrug and converted to more active 6-mercaptopurineSelectively inhibits T cell differentiation and function of T cellsMost important application - graft rejections/e - bone marrow suppression", 'role': 'assistant'}]