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 region where internal and external epithelia meet at the rim of the enamel organ is known as: \nSelect and explain. \nA. Zone of reflexion., B. Enamel Knot., C. Dental follicle., D. Enamel cord.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The region where the internal and external dental epithelia meet at the rim of the enamel organ is known as the zone of reflexion or cervical loop.', 'role': 'assistant'}]