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: Surgery
[{'content': 'Dye used in IV cholangiography is ? \nSelect and explain. \nA. Di an soil, B. Conray, C. Biligraffin, D. Myodil', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Biligraffin", 'role': 'assistant'}]