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 stress at which a material exhibits a specified limiting deviation from proportionality of stress to strain is known as: \nSelect and explain. \nA. Proportional limit, B. Tensile strength, C. Ultimate strength, D. Yield strength', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Yield strength often is a property that represents the stress value at which a small amount (0.1% or 0.2%) of plastic strain\xa0has occurred. A value of either 0.1% or 0.2% of the plastic strain is often selected and is referred to as the percent offset. The yield strength is the stress required to produce the particular offset strain (0.1% or 0.2%) that has been chosen.\xa0The\xa0yield\xa0strength\xa0for\xa00.2%\xa0 offset\xa0 is\xa0 greater than that associated with an offset of 0.1%. If yield strength values for two materials tested under the same conditions are to\xa0be\xa0compared,\xa0identical\xa0offset\xa0values\xa0should\xa0be\xa0used.\nKey concept:\xa0 Yield strength is defined as the stress at which a material exhibits a specified limiting deviation from proportionality of stress to strain.\nPhillips dental materials 12th edition page no 49,57', 'role': 'assistant'}]