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': 'According to ADA specification number 12, dough\nforming time should be less than ____________  min from\nthe start of the mixture. \nSelect and explain. \nA. 90 min, B. 60 min, C. 50 min, D. 40 min', 'role': 'user'}, {'content': 'Answer: D \nExplanation: DOUGH-FORMING TIME\nThe time required for the resin mixture to reach a doughlike stage is termed the dough-forming time. American National Standards Institute/American Dental Association (ANSI/ADA) Specification No.12 (ISO 20795-1:2008: Dentistry—Base polymers—Part 1: Denture base polymers) for denture base resins requires that this consistency be attained in less than 40 min from the start of the mixing process. In clinical use, the majority of denture base products reach a doughlike consistency in less than 10 min.\nKey Concept:\xa0\nDenture base resins requires that dough consistency be attained in less than 40 min from the start of the mixing process.\nReference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 478', 'role': 'assistant'}]