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 most commonly used Titanium alloy for dental and medical purposes is: 
Select and explain. 
A. Ti 6Al 4V, B. Ti 5Al 4V, C. Ti 5Al 5V, D. Ti 6Al 6V
A: Ti 6Al 4V
Answer: A: Ti 6Al 4V 
Explanation: The most commonly used Titanium alloy for dental and medical purposes is Ti 6Al 4V.
Modern implantology is only possible because of the biocompatibility of commercially pure (cp) titanium or a titanium/aluminium/vanadium (Ti-6Al-4V) alloy.