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 24 hours is: \nSelect and explain. \nA. More than 60%, B. More than 70%, C. More than 80%, D. More than 90%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The strength attained by amalgam within 24 hours is more than 90%.\nReference: Marzouk Operative dentistry, pg-111', 'role': 'assistant'}]