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
New born formation occurs: 
Select and explain. 
A. 2-4 days after surgery., B. 6 days after surgery., C. 10 days after surgery., D. 14 days after surgery.
B: 6 days after surgery.
Answer: B: 6 days after surgery. 
Explanation: None