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': 'Morphological stages of tooth development are explained based on: \nSelect and explain. \nA. Shape of enamel organ, B. Shape of tooth germ, C. Functions of enamel organ, D. Shape of dental papilla', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Morphological stages of tooth development, i.e. bud, cap and bell stage are named after the shape of enamel organ.', 'role': 'assistant'}]