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': "Terminal portion of Hertwig's epithelial root sheath will form a tapering tooth root.The terminal portion has been called: \nSelect and explain. \nA. Apical loop., B. Epithelial Diaphragm., C. Cementum., D. None of the Above.", 'role': 'user'}, {'content': "Answer: A \nExplanation: The terminal portion of Hertwig's epithelial root sheath will form a tapering tooth root. The terminal portion has been called the apical loop.", 'role': 'assistant'}]