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
Apicoectomy is contraindicated in 
Select and explain. 
A. Extensive bone loss, B. Over filled root canals, C. Lateral perforation at apical third, D. Is not contraindicated
A: Extensive bone loss
Answer: A: Extensive bone loss 
Explanation: None