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 secondary flare is necessary for several reasons. Which of the following statements is not true? \nSelect and explain. \nA. Makes the proximal margins more, B. The direction of the flare results in 100-degree marginal metal, C. Metal with this angular design is burnishable, D. A more blunted and stronger enamel margin is produced because of the secondary flare', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The secondary flare is necessary for several reasons:\n\nThe secondary\xa0flaring\xa0of\xa0the\xa0proximal\xa0walls\xa0extends\xa0margins\xa0into\xa0the embrasures, making these margins more self-cleansing and more accessible to finishing procedures during the inlay insertion appointment and does so with conservation of dentin.\nThe direction of the flare results in 40o marginal metal. Metal with this angular design is burnishable; however, metal shaped at a larger angle is unsatisfactory for burnishing; metal with an angle less than 30o is too thin and weak, with a corresponding enamel margin that is too indefinite and ragged.\nA more blunted and stronger enamel margin is produced because of the secondary flare.\n\nSturdevant operative dentistry\xa07th Edition, Page No:e107', 'role': 'assistant'}]