This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'DPP4 inhibitor requiring dose reduction in both liver and kidney failure \nSelect and explain. \nA. Linagliptin, B. Sitagliptin, C. Saxagliptin, D. Vildagliptin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vildagliptin require and of both reductions in liver and kidney failure.Ref: KDT 7TH/275', 'role': 'assistant'}]