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': "Hertwig's root sheath is formed from \nSelect and explain. \nA. Stratum inter medium, B. Stellate reticulum, C. Outer enamel epithelium, D. Cervical loop/ Enamel Organ", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]