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': 'Inability of material to withstand plastic strain or deform plastically before fracture is known as: \nSelect and explain. \nA. Hardness, B. Fracture toughness, C. Brittleness, D. Pseudoplasticity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]