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
Inability of material to withstand plastic strain or deform plastically before fracture is known as: 
Select and explain. 
A. Hardness, B. Fracture toughness, C. Brittleness, D. Pseudoplasticity
C: Brittleness
Answer: C: Brittleness 
Explanation: None