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
Type III Cu NiTi is used for ? 
Select and explain. 
A. Patient has low to normal pain threshold, B. Where rapid tooth movement required, C. More force required, D. Patient has good pain threshold
A: Patient has low to normal pain threshold
Answer: A: Patient has low to normal pain threshold 
Explanation: None