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': 'Enamelin \nSelect and explain. \nA. Largest non amelogenin protein, B. Helps in nucleation, C. Secreted at mineralization front, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]