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': 'Minor connector for the mandibular distal extension base should extend: \nSelect and explain. \nA. Half the length of edentulous ridge, B. Two thirds the Length of edentulous ridge, C. Full length of edentulous ridge, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]