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
The type of strain develop when force is applied perpendicular to surface 
Select and explain. 
A. Compressive strain, B. Tensile strain, C. Shear stress, D. Tensile stress
A: Compressive strain
Answer: A: Compressive strain 
Explanation: None