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 cavosurface gingival bevel for a class II cast gold inlay preparation should be \nSelect and explain. \nA. 0.5 to 1 mm wide and blend with secondary lingual flare, B. 0.2 to 0.3 mm wide and blend with secondary lingual flare, C. 0.2 mm wide and blend with secondary lingual flare, D. 3 to 4 mm wide and blend with secondary lingual flare', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The gingival\xa0bevel should be 0.5 to 1 mm wide and should blend with the\xa0lingual secondary flare.\nSturdevant Operative Dentistry 7th edition page. e105', 'role': 'assistant'}]