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': 'The cells that form secondary dentin are \nSelect and explain. \nA. Cementoblasts, B. Fibroblasts, C. Odontoblasts, D. Osteoblasts', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]