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
Size of the bur for preparing lingual rest seat for a RPD is 
Select and explain. 
A. 1/10 inch, B. 1/4 inch, C. 1/2 inch, D. 1 inch
B: 1/4 inch
Answer: B: 1/4 inch 
Explanation: To prepare the lingual rest in enamel, a safe side 1/4 inch diamond disk should be used.
Occlusal rest seats in sound enamel may be prepared with diamond points of approximately the size of No. 6 and round burs.