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': 'Which of the following is true of cellular cementum? \nSelect and explain. \nA. Forms during root formation, B. Forms after the eruption of the tooth, C. Seen at the coronal portion of the tooth, D. Formation is a slow process', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]