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
A 60 year old male patient complains of food lodgment in upper right back teeth region. Patient gives h/o RCT with 16 and 17. Crown cutting was done with 16 and 17 and impression was taken with type V gypsum product. The setting expansion of this gypsum material is- 
Select and explain. 
A. 0.10%, B. 0.15%, C. 0.30%, D. 0.20%
C: 0.30%
Answer: C: 0.30% 
Explanation: The setting expansion has been increased from a maximum of 0.10% to 0.30%. The rationale for increasing setting expansion is that certain newer alloys, such as base metal, have a greater casting shrinkage than do the traditional noble metal alloys. Thus, higher expansion is required in the stone die to aid in compensating for the alloy solidification shrinkage.