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
How much labial reduction is needed for a porcelain
fused to metal 
Select and explain. 
A. 0.5 - 1 mm, B. 1 - 1.5 mm, C. 1.5 - 2 mm, D. 1.75 - 2 mm
C: 1.5 - 2 mm
Answer: C: 1.5 - 2 mm 
Explanation: None