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
Cementum covers resected root end in: 
Select and explain. 
A. 12 days, B. 20 days, C. 28 days, D. 8 weeks
C: 28 days
Answer: C: 28 days 
Explanation: Proliferation of granulation tissue from the severed PDL was observed at 4 days, and the tissue had completely encapsulated the root end at 8 days. In the experimental groups, cementum deposition was observed at 12 days, and by 16 days, cementum covered more than 50% of the surface areas of the resected root ends. 
The complete healing will take around 4 weeks.