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
Recommended angle of root end resection is: 
Select and explain. 
A. 45 degree, B. 0 degree, C. 30 degree, D. 15 degree
B: 0 degree
Answer: B: 0 degree 
Explanation: None