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
Ultimate tensile strength refers to: 
Select and explain. 
A. Stress before rupture, B. Stress after rupture, C. Longitudinal compressive strength, D. Horizontal compressive strength
A: Stress before rupture
Answer: A: Stress before rupture 
Explanation: Tensile strength (ultimate tensile strength)—Tensile stress at the instant of fracture.
The ultimate tensile strength is defined as the tensile stress within a structure at the point of rupture.
Phillips dental materials 12th edition page no 49,57