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 the most common cause of overdenture abutment failure? 
Select and explain. 
A. Caries, B. Periodontal complications, C. Endodontic complications, D. None of the above
B: Periodontal complications
Answer: B: Periodontal complications 
Explanation: Most frequent cause of overdenture abutment failure is periodontal complication (70%) followed by caries (25%) and endodontic complications (5%).