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': 'Rejuvenation of gutta-percha can be changed from a to b form at \nSelect and explain. \nA. 55 - 59° F, B. 55 - 59° C, C. 20 - 25° C, D. 20 - 25° F', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]