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
Radiocontrast is contraindicated in all of the following conditions except? 
Select and explain. 
A. Renal failure, B. Patient on metformin, C. Dehydration, D. Obesity
D: Obesity
Answer: D: Obesity 
Explanation: 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.