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': 'Development of supporting tissues of the tooth is initiated by \nSelect and explain. \nA. Cells of dental follicle, B. Cells of odontogenic layer, C. Cementoblasts, D. Cells of the gingiva', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]