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 not true, regarding abutment selection for overdenture  fabrication? 
Select and explain. 
A. Abutment should have healthy periodontal tissues, B. If bone loss is present, teeth should not be selected as overdenture abutments, C. A circumferential band of attached gingiva should be present, D. If a tooth has grade III mobility, it should not be selected as overdenture abutment
B: If bone loss is present, teeth should not be selected as overdenture abutments
Answer: B: If bone loss is present, teeth should not be selected as overdenture abutments 
Explanation: If mild to moderate bone loss is present, change in crown:root ratio can make the tooth suitable as an overdenture abutment.