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': 'ADA specification number for gypsum products are described under: \nSelect and explain. \nA. 1, B. 4, C. 12, D. 25', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]