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
Failure of casting to seat on the cast is overcomed by 
Select and explain. 
A. Scraping the cast to seat, B. Forcefully position the casting, C. Wash the casting with HCl, D. Discard if the discrepancy is more than 0.3mm
D: Discard if the discrepancy is more than 0.3mm
Answer: D: Discard if the discrepancy is more than 0.3mm 
Explanation: None