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
"Guiding planes" relates to: 
Select and explain. 
A. Path of insertion, B. Means of retention, C. Extent of undercuts, D. Tilt of abutment teeth
A: Path of insertion
Answer: A: Path of insertion 
Explanation: None