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 amount of reduction required for a tooth for all
metal crown restoration is: 
Select and explain. 
A. So that there is proper clearance between the teeth, B. So that the tooth architecture interferes with the arch of rotation, C. So that the tooth architecture doesn't interferes with the arch of rotation, D. At least 2mm on all the surfaces
B: So that the tooth architecture interferes with the arch of rotation
Answer: B: So that the tooth architecture interferes with the arch of rotation 
Explanation: None