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 tray is more suitable for final impression, when conventional immediate denture is to be fabricated? 
Select and explain. 
A. Single full arch custom impression tray, B. Sectional custom tray, C. Perforated full arch custom tray, D. None of the above
B: Sectional custom tray
Answer: B: Sectional custom tray 
Explanation: Sectional tray method or two tray method for final impression can be employed, only when posterior teeth has been removed. It cannot be used when interim immediate denture is used, as posterior teeth are usually present at stage of final impression making.