This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Antidiabetic Safe in liver and renal failure \nSelect and explain. \nA. Linagliptin, B. Insulin, C. None, D. Both', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Linagliptin (oral)-DPP4 inhibitor and insulin(SC) are safe in renal and liver failure. Ref: Katzung 12th ed.', 'role': 'assistant'}]