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': 'Typically rapid palatal expansion is done with a jack screw that is activated at the rate of: \nSelect and explain. \nA. 1.0 to 2.0 mm/week, B. 1.0 to 2.0 mm/day, C. 0.5 to 1.0 mm/week, D. 0.5 to 1.0 mm/day', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Every turn of the screw opens the appliance by 0.25 mm.\xa0\nEach turn involves 90° activation.\xa0\nWith rapid maxillary expansion at a rate of 0.5–1 mm/day, a 10 mm expansion is achieved in 2–3 weeks.\n\nTextbook of ORTHODONTICS Sridhar Premkumar', 'role': 'assistant'}]