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': 'Successional lamina shows at which stage of enamel organ of deciduous teeth: \nSelect and explain. \nA. Cap Stage., B. Bud Stage., C. Appositional Stage., D. Bell Stage.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]