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': 'Hollow ground bevel is? \nSelect and explain. \nA. Knife edge, B. Exaggerated chamfer, C. Shoulder, D. Shoulder with bevel', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hollow ground (concave) bevel:\n\nUsed when\xa0 cusp required to cover with cast metal\nPrepared with 12 fluted round ended bur\nProvide sufficient bulk of restoration at cavosurface margin\nIt is an exaggerated chamfer basically\nAlso known as concave bevel\nIn posterior ceramic restorations at cavosurface angle hollow-ground chamfer confined to the marginal enamel will aid in developing a more effective seal', 'role': 'assistant'}]