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': 'The cap stage in tooth development is characterized by \nSelect and explain. \nA. morphodifferentiation, B. reversal of functional polarity, C. formation of hammock ligament, D. Increased mitotic activity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mitosis or proliferation of cells occurs mainly in bud, cap and early bell stage. For morphodifferentiation the important stage is advanced bell stage. Reversal of the functional polarity occurs in the organizing stage of life cycle of ameloblasts. Cushion hammock ligament is hypothesized as an important structure for tooth eruption.', 'role': 'assistant'}]