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
The floor of the occlusal rest is: 
Select and explain. 
A. Ledge shaped, B. Half pear shaped, C. Spoon shaped, D. Half moon shaped
C: Spoon shaped
Answer: C: Spoon shaped 
Explanation: None