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
What is the amount of occlusal reduction required for metal ceramic facing on the non-functional cusp? 
Select and explain. 
A. 0.5 - 1 mm, B. 1 - 1.5 mm, C. 1.5 - 2 mm, D. 2 - 2.5 mm
A: 0.5 - 1 mm
Answer: A: 0.5 - 1 mm 
Explanation: None