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': 'Which one of the following contrast medium is used for IVP? \nSelect and explain. \nA. Lipoidil, B. Dianosil, C. Sod. diatrizoate (Hypaque), D. Conray-420', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Sod. diatrizoate (Hypaque)', 'role': 'assistant'}]