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
Acellular cementum is derived from: 
Select and explain. 
A. Dental sac, B. Dental lamina., C. HERS., D. Enamel Lamellae.
C: HERS.
Answer: C: HERS. 
Explanation: None