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 American Dental Association (ADA) Specification No. 5 for Dental Casting Gold Alloys specifies : \nSelect and explain. \nA. Minimum total gold-plus-platinum-metals -75 (wt%), B. Minimum total gold-plus-platinum-metals -25 (wt%), C. Minimum total gold-plus-platinum-metals -55 (wt%), D. Minimum total gold-plus-platinum-metals >75 (wt%)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The American Dental Association (ADA) Specification No.5 for Dental Casting Gold Alloys requires a minimum total gold-plus-platinum-metals content of 75 weight percent (wt%).\xa0\nSturdevant operative dentistry\xa07th Edition, Page No:e94', 'role': 'assistant'}]