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
Intra enamel depth preparation in porcelain laminate
veneer 
Select and explain. 
A. 0.5 mm, B. 0.75 mm, C. 1 mm, D. 2 mm
A: 0.5 mm
Answer: A: 0.5 mm 
Explanation: None