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': 'The purpose of investment setting expansion is to compensate for \nSelect and explain. \nA. Casting Shrinkage, B. Casting expansion, C. Wax elimination, D. Alloy melting', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The rationale for increasing setting expansion is that certain newer alloys, such as base metal, have a greater casting shrinkage than do the traditional noble metal alloys. Thus, higher expansion is required in the stone die to aid in compensating for the alloy solidification shrinkage.\nPhillips 12th edition page no 191', 'role': 'assistant'}]