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 minor connector for a mandibular distal extension base should extend posteriorly about _____. 
Select and explain. 
A. Two-third the length of the edentulous ridge, B. Half the length of the edentulous ridge, C. One-third the length of the edentulous ridge, D. As long as possible
A: Two-third the length of the edentulous ridge
Answer: A: Two-third the length of the edentulous ridge 
Explanation: The minor connector for the mandibular distal extension base should extend posteriorly about two thirds the length of the edentulous ridge; this adds strength to the denture base.