This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
[{'content': 'Radiocontrast is contraindicated in all except - \nSelect and explain. \nA. Renal failure, B. Patient on metformin, C. Dehydration, D. Obesity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Impoant risk factors for contrast induced nephropathy (CIN) : Renal failure Diabetes Hypeension Dehydration Patient on metformin Hyperuricemia', 'role': 'assistant'}]