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': 'Which of the following drug is contraindicated in liver disease? \nSelect and explain. \nA. Sitagliptin, B. Saxagliptin, C. Vildagliptin, D. Alogliptin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Viidagliptin is a DPP - 4 inhibitor\xa0which can lead to hepatotoxicity.', 'role': 'assistant'}]