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 hertwig's epithelial root sheath is essential to development of the root because it \nSelect and explain. \nA. Gives rise to cementoblasts that produce cementum of the root, B. Moulds the shape of roots and stimulates differentiation of odontoblasts, C. Given rise to odontoblasts that lay down dentin of the root, D. Remains as an essential constituent of the periodontal ligament", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]