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
The dental pulp is derived form 
Select and explain. 
A. Dental papilla, B. Dental sac, C. Odontoblasts, D. Stellate reticulum
A: Dental papilla
Answer: A: Dental papilla 
Explanation: None