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 5A1 4 V, C. Ti 5Al 5V, D. Ti 6Al 6 V', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]