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 the following is a tertiary monoblock system of obturation of the root canal. 
Select and explain. 
A. Resilon monoblock obturation, B. Active Gutta percha, C. Orthograde obturation with MTA, D. Gutta Percha and AH plus sealer
B: Active Gutta percha
Answer: B: Active Gutta percha 
Explanation: None