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
According to wein if there is bone resorption but no tooth resorption then substract ……..from the radiographic length 
Select and explain. 
A. 1mm, B. 1.5 mm, C. 2mm, D. 2.5 mm
B: 1.5 mm
Answer: B: 1.5 mm 
Explanation: None