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
Modification spaces are: 
Select and explain. 
A. Spaces other than the original class, B. Space posterior to all teeth, C. Space anterior to all teeth, D. Additional space in class IV
A: Spaces other than the original class
Answer: A: Spaces other than the original class 
Explanation: None