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': 'Matrix vesicles play important role in the mineralization of \nSelect and explain. \nA. Dentin, B. Enamel, C. Pulp, D. Periodontal ligament', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]