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
If multiple firing is done to opaque layer of dental porcelain than It become 
Select and explain. 
A. Too Smooth, B. Too glazed, C. Become more opaque, D. Crack
B: Too glazed
Answer: B: Too glazed 
Explanation: None