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 bleach, 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: None', 'role': 'assistant'}]