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
The cyst is `deroofed' and the surrounding periosteum
sutured to the margins of the cyst wall in 
Select and explain. 
A. Decortication, B. Marsupialisation, C. Saucerization, D. Enucleation
B: Marsupialisation
Answer: B: Marsupialisation 
Explanation: None