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': 'An abutment tooth exhibiting an unfavorable survey line should: \nSelect and explain. \nA. Be restored, B. Have unfavorable contours improved, C. Be by-passed in the frame work design, D. Receive only a rest and not to be clasped', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]