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
For PPS scoring on cast best instrument is? 
Select and explain. 
A. Wax spatula, B. BP Blade no.22, C. Kingsley scraper, D. Hollenbeck carver
C: Kingsley scraper
Answer: C: Kingsley scraper 
Explanation: None