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 Cemento-dentinal junction? \nSelect and explain. \nA. Most important\tanatomical\tlandmark\tfor determining the location of pulp chambers and root canal orifices, B. Point where pulp tissue ends and periodontal tissue begins, C. Space between major and minor foramina, D. Rounded edge that differentiates the termination of the cemental canal from the exterior surface of root.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]