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': 'Angulation of the counter bevel placed in cast restoration is determined by: \nSelect and explain. \nA. Amount of indicated involvement for facial/lingual surface, B. Measured by the embracing angle, C. Amount of needed retention, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Angulation of the Counter Bevel\nMeasured by the embracing angle: Angle between the bevel and the long axis of the crown - 30 to 70 degrees.\nFactors Determining the Angulation\n1. Amount of indicated involvement for the facial / lingual surface:\n\nThe more the desirable involvement is, the less will be the embracing angle to preserve tooth structure.\n\n2. Amount of needed retention:\n\nThe shorter the preparation walls, the less will be the embracing angle with the long axis.\nMay be parallel to the intracoronal wall proper.\n\n3. Type of cast alloy:\n\nThe less the castability, the greater will be the embracing angle.\nAllows more bulk marginally.', 'role': 'assistant'}]