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
[{'content': 'Endodontic implants refers to those \nSelect and explain. \nA. Used to obturate the canal, B. used to stabilize periodontally weakened with poor crown root ratio, C. Placed between periosteum and cortex of bone, D. Which are embedded within the bon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]