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 a rare occurrence \nSelect and explain. \nA. Enamel meet cementum at a point, B. Enamel overlaps cementum, C. Cementum overlaps enamel, D. Both never meet', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]