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
Draining abscess by cutting a window in the bone is 
Select and explain. 
A. Hiltons method, B. Trephination, C. Marsupialisation, D. Odontectomy
B: Trephination
Answer: B: Trephination 
Explanation: None