This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Targeted Anticancer Drugs and Immunosuppressants, Subject name: Pharmacology
[{'content': 'Which of the following drugs inhibits de novo synthesis of purines? \nSelect and explain. \nA. Cyclosporine, B. Tacrolimus, C. Mycophenolate, D. Infliximab', 'role': 'user'}, {'content': "Answer: C \nExplanation: By inhibiting the enzyme IMP (Inosine 5' Monophosphate) dehydrogenase, mycophenolate inhibits the de novo synthesis of purines.", 'role': 'assistant'}]