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
About gutta-percha all are true, except: 
Select and explain. 
A. It contains 60-70% gutta-percha and 20% ZnO, B. Can be sterilized by heating, C. With time they become brittle, D. It has two forms α and β
B: Can be sterilized by heating
Answer: B: Can be sterilized by heating 
Explanation: None