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 ideal occlusal clearance for a complete cast crown is: 
Select and explain. 
A. 0.5 m, B. 1.5 mm, C. 2 m, D. 2.5 mm
B: 1.5 mm
Answer: B: 1.5 mm 
Explanation: None