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
The micro organism previously present in the Periapical
tissues following obturation 
Select and explain. 
A. Persist and stimulate the formation of a granuloma, B. Are eliminated by the natural defenses, C. Re-enter and re-infect the sterile canal and are removed by surgery, D. Are eliminated by the medicaments used in endodontic treatment
B: Are eliminated by the natural defenses
Answer: B: Are eliminated by the natural defenses 
Explanation: None