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 product is: \nSelect and explain. \nA. 20, B. 25, C. 15, D. 7', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ADA\xa0Specification\xa0No.\xa025\xa0classifies\xa0five\xa0types\xa0of\xa0gypsum products,\xa0with the property requirement for each type.', 'role': 'assistant'}]