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': 'The best treatment for class V lesion on a tooth along with extensive class II caries is: \nSelect and explain. \nA. Restoration of class II followed by class V, B. Cast gold restoration, C. A full  crown restoration, D. Restoration of class V followed by class II', 'role': 'user'}, {'content': 'Answer: C \nExplanation: With class V lesion and extensive class II cavity in the same\xa0tooth\xa0 the\xa0 remaining\xa0 enamel\xa0 surface\xa0 with\xa0 the\xa0 supported\xa0healthy dentin will be much less hence\xa0 in such situation full\xa0crown restoration will be long lasting.', 'role': 'assistant'}]