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
Which of these is not true regarding guttapercha? 
Select and explain. 
A. 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
A: 60-70% Gutta Percha
Answer: A: 60-70% Gutta Percha 
Explanation: None