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
Which of the following is not true of a fixed appliance 
Select and explain. 
A. Economical, B. Rotation and extrusion movements are possible, C. Patient co-operation is not required, D. Tipping and bodily movement are possible
A: Economical
Answer: A: Economical 
Explanation: None