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: Surgery
Rubber band extraction is indicated in haemophiliac patient, as it facilitates the extraction by: 
Select and explain. 
A. Traction force on PDL, B. Necrosis of alveolar bone, C. Necrosis of PDL, D. Pulling of the PDL
C: Necrosis of PDL
Answer: C: Necrosis of PDL 
Explanation: None