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
If a spring is activated by 0.5 mm and it generates a 
force of 150 gm, the load deflection rate of spring 
would be: 
Select and explain. 
A. 75 gm/mm, B. 150 gm/mm, C. 175 gm/mm, D. 300 gm/mm
D: 300 gm/mm
Answer: D: 300 gm/mm 
Explanation: STIFFNESS OR LOAD DEFLECTION RATE 
This is the force magnitude delivered by an appliance and is proportional to the modulus of elasticity (E). Low stiffness leads to an ability to apply lower forces, a more constant force to be delivered over time and greater ease and accuracy in applying a given force.