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': 'Extension of enamel cord to meet the outer enamel epithelium is known as: \nSelect and explain. \nA. Enamel knot., B. Enamel cord., C. Enamel septum., D. Enamel navel.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]