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 elastic modulus of dental amalgam: \nSelect and explain. \nA. 21 GPa at slow rates of loading, B. 35 GPa at slow rates of loading, C. 94 GPa at high rates of loading, D. Both 1 and 3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Another example of strain-rate\xa0dependence\xa0is\xa0the\xa0elastic\xa0modulus\xa0of\xa0dental\xa0amalgam, which is 21 GPa at slow rates of loading and\xa062 GPa at high rates of loading. A viscoelastic material therefore may have widely different mechanical\xa0properties depending on the rate of load application,\xa0and for these materials, it is particularly important to\xa0specify the loading rate with the test results.\nRef:Craig’s Restorative Dentistry ed 14th pg 41', 'role': 'assistant'}]