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': 'Acellular cementum is derived from: \nSelect and explain. \nA. Dental sac, B. Dental lamina., C. HERS., D. Enamel Lamellae.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]