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
Maximum stress that a material can withstand without permanent deformation is known as: 
Select and explain. 
A. Proportional limit., B. Elastic limit., C. Strain., D. Yield strength.
B: Elastic limit.
Answer: B: Elastic limit. 
Explanation: None