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': "Which of these is not true regarding guttapercha? \nSelect and explain. \nA. 60-70% Gutta Percha, B. It can't be heat sterilized, C. Can stain the crown, D. 25 size cone is used for sinus tracing", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]