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 strength attained by amalgam within 8 hours is \nSelect and explain. \nA. 60%, B. 70%, C. 80%, D. 90%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The strength attained by amalgam within 8 hours is 70%.\nReference: Phillip’s Science of Dental Materials, Pg-353', 'role': 'assistant'}]