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': "Radiographic appearance of the inferior dental canal and roots of the mandibular third molar \nSelect and explain. \nA. Tram lines visible, B. Radiolucent band evident in relation to root of third molar which is grooved tunneled, C. Winter's lines, D. Tram lines enhanced", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]