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 tensile strength of dental amalgam is \nSelect and explain. \nA. 27-55 MPa, B. 60-100 MPa, C. 120-140 MPa, D. 18-20 MPa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]