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
Repeated fracture of a porcelain fused to metal restoration is primarily due to 
Select and explain. 
A. Occlusal trauma, B. Inadequately designed framework, C. Improper firing schedule, D. Failure to use metal conditioner
B: Inadequately designed framework
Answer: B: Inadequately designed framework 
Explanation: None