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
Second step of respective osseous surgery: 
Select and explain. 
A. Vertical grooving, B. Radicular blending, C. Gradualizing bone margins, D. Flattening of 1/P bone
B: Radicular blending
Answer: B: Radicular blending 
Explanation: Steps for Resective Osseous Surgery

Vertical grooving
Radicular blending
Interproximal bone flattening
Gradualization of marginal bone