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 disadvantages of a complete ceramic crown include 
Select and explain. 
A. Reduced strength of the restoration, B. Need for a shoulder-type margin circumferentially, C. Porcelain brittleness, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None