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: Radiology
[{'content': 'Radiocontrast is contraindicated in all of the following conditions except? \nSelect and explain. \nA. Renal failure, B. Patient on metformin, C. Dehydration, D. Obesity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Obesity is not a contra-indication for the administration of radio-contrast agent. Ref: Radiologic Technology at a Glance By Theresa S. Reid-Paul; pages 66.', 'role': 'assistant'}]