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
Custom tray is better than stock tray for impression of crown due to following reasons except: 
Select and explain. 
A. Custom tray is easy to adapt, B. Stock tray may not record full flange, C. Custom tray is cheaper, D. Stock tray can distort easily
C: Custom tray is cheaper
Answer: C: Custom tray is cheaper 
Explanation: None