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
Which of the following is the least favorable form of repair after root fracture? 
Select and explain. 
A. Healing with calcified tissue, B. Healing with interposition of connective tissue., C. Healing with interposition of bone and connective tissue, D. Healing with interposition of granulation tissue
D: Healing with interposition of granulation tissue
Answer: D: Healing with interposition of granulation tissue 
Explanation: None