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 all the regions of tooth enamel formation proceeds: \nSelect and explain. \nA. Pulp to DEJ., B. DEJ to Pulp., C. DEJ to surface., D. Surface to DEJ.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]