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
The standard perforated tray for use with alginate impression materials may be brought to more customized contour by: 
Select and explain. 
A. Utility wax, B. Base plate wax, C. Beading wax, D. Boxing wax
A: Utility wax
Answer: A: Utility wax 
Explanation: None