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
Factors which decrease the cement space for a complete crown would be 
Select and explain. 
A. Thermal and polymerization shrinkage of the impression material, B. Use of a solid cast with individual stone dies, C. Use of an internal layer of soft wax, D. Use of resin or electroplated dies
D: Use of resin or electroplated dies
Answer: D: Use of resin or electroplated dies 
Explanation: None