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
The region where internal and external epithelia meet at the rim of the enamel organ is known as: 
Select and explain. 
A. Zone of reflexion., B. Enamel Knot., C. Dental follicle., D. Enamel cord.
A: Zone of reflexion.
Answer: A: Zone of reflexion. 
Explanation: 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.