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
A rest seat is prepared as: 
Select and explain. 
A. Spoon shaped depression with the apex towards the center of the tooth, B. Concavity with hemisphere shape, C. Elliptical shape, D. Rhomboid depression limited to enamel
A: Spoon shaped depression with the apex towards the center of the tooth
Answer: A: Spoon shaped depression with the apex towards the center of the tooth 
Explanation: None