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': 'All of the following are contraindications for root\nplanning EXCEPT \nSelect and explain. \nA. deficient or overhanging margins of amalgam restorations, B. erosion and /or abrasion, C. recession, D. root caries', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]