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': 'All of these are true for home bleaching technique, except: \nSelect and explain. \nA. Dentist prescribed home technique, B. It contains 10-15% carbamide peroxide, C. Bleaching both arches at one time is preferred, D. Patient compliance is needed', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HOME BLEACHING TECHNIQUE/NIGHT GUARD BLEACHING\nCommonly used solution for night guard bleaching\xa0\n\n10% carbamide peroxide with or without carbopol.\xa0\n15% carbamide peroxide.\nHydrogen peroxide (1-10%).\xa0\n\nKey concept:\xa0\nBleaching would be done only one arch at a time.', 'role': 'assistant'}]