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
Arch perimeter can be measured with 
Select and explain. 
A. Cephalogram, B. Brass wire, C. Vernier calipers, D. Occlusal radiograph
B: Brass wire
Answer: B: Brass wire 
Explanation: None