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
What is the use of boxing an impression? 
Select and explain. 
A. Ease of construction of denture, B. Preserving the sulci, C. Ease of pouring an impression, D. All of the above
C: Ease of pouring an impression
Answer: C: Ease of pouring an impression 
Explanation: BOXING WAX AND BEADING WAX 
USES 
Used to build up vertical walls around the impression, in order to pour the stone and make a cast. The procedure is known as boxing. 
SUPPLIED AS 
Boxing wax as sheets, beading wax as strips.
ADVANTAGES OF BEADING AND BOXING 

Preserves the extensions and landmarks. 
Controls the thickness of the borders. 
Controls the form and thickness of the base of the cast. 
Conserves the artificial stone. 

PROPERTIES 
They are pliable and can be adapted easily. A slight tackiness allows it to stick to the impression.
Note: The terms carding wax and boxing wax have been used interchangeably. Carding wax was the original material on which porcelain teeth were fixed when received from the manufacturer. Boxing wax is a more acceptable term.