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': 'Graham Cole test refers to - \nSelect and explain. \nA. Oral cholecystography, B. Intravenous cholangiography, C. Pre-operative cholangiography, D. Post-operative cholangiography', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]