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': 'In bitewing radiographs, occlusal pit caries of enamel\nappears as a \nSelect and explain. \nA. Circular radiolucent area, B. Triangular radiolucent area with its base towards the dentino-enamel junction, C. Triangular radiolucent area with its base towards the surface, D. Vertical radiolucent line', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]