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
[{'content': 'The most commonly used Titanium alloy for dental and medical purposes is: \nSelect and explain. \nA. Ti 6Al 4V, B. Ti 5Al 4V, C. Ti 5Al 5V, D. Ti 6Al 6V', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most commonly used Titanium alloy for dental and medical purposes is Ti 6Al 4V.\nModern implantology is only possible because\xa0of\xa0the\xa0biocompatibility of commercially pure (cp) titanium or a titanium/aluminium/vanadium (Ti-6Al-4V) alloy.', 'role': 'assistant'}]