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: Dental
[{'content': 'In primary teeth, gingival seat in a class II preparation is: \nSelect and explain. \nA. Left unbevelled, B. Beveled so as to remove caries, C. Beveled so as to remove unsupported enamel rods, D. Beveled same as permanent tooth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]