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': 'Blurred and narrow IAN canal seen in radiograph suggests: \nSelect and explain. \nA. Canal passing between 2 roots, B. Roots perforated by canal, C. Canal superimposed, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]