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
[{'content': 'Factors which decrease the cement space for a complete crown would be \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]