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
A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have: 
Select and explain. 
A. Greater ductility, B. Greater toughness, C. A higher modulus of elasticity, D. More resistance to permanent deformation
D: More resistance to permanent deformation
Answer: D: More resistance to permanent deformation 
Explanation: Proportional limit—Magnitude of elastic stress above which plastic deformation occurs.
A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have more resistance to permanent deformation.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 48