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': 'Non acidic, nonionic protein which helps in enamel mineralization \nSelect and explain. \nA. Tuftelin, B. Sheathlin, C. Enamelin, D. Amelogenin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]