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 unalloyed form of titanium used to form dental implants is in the \nSelect and explain. \nA. beta form, B. alpha form, C. gamma form, D. delta form', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]