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
Method of Gutta purcha removal from canal for post preparation: 
Select and explain. 
A. Chemical GP solvent, B. Thermal, C. Mechanical, D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: chemical method is not recommended as no control on length of removal.
While thermal (heated plugger), mechanical ( peaso reamer) have equal efficiency.