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': 'Property of the material, which describes the resistance to abrasion is: \nSelect and explain. \nA. Hardness, B. Yield strength, C. Modulus of elasticity, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HARDNESS\nExcept for comparing one material with another, this term is difficult to define. In mineralogy, the relative hardness of a substance is based on its ability to resist scratching. In metallurgy and most other disciplines, the concept that is most generally accepted is that of “resistance to indentation.” It is on the basis of this process that most modern hardness tests are designed.\nReference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 63', 'role': 'assistant'}]