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 dental pulp is derived form \nSelect and explain. \nA. Dental papilla, B. Dental sac, C. Odontoblasts, D. Stellate reticulum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]