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
Material of choice for incremental border moulding is: 
Select and explain. 
A. Polyether, B. Greenstick compound., C. Polysulphide, D. None
B: Greenstick compound.
Answer: B: Greenstick compound. 
Explanation: Incremental or sectional border moulding: It is a procedure, in which portions of the periphery of the tray are refined individually. The material of choice for this procedure is green stick compound