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
The purest form of metal used in Dental casting 
Select and explain. 
A. CpTi, B. NiTi, C. Gold, D. Co-Cr
A: CpTi
Answer: A: CpTi 
Explanation: Commercially pure titanium (CPTi), which is important for implants and restorative dentistry, consists of high-purity (99 wt% or higher) titanium, with oxygen, carbon, nitrogen, and hydrogen atoms dissolved interstitially.
Phillip’s 12th edition page 80