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': 'According to American Board of Orthodontics recommendation for colour coding of sequential tracing, end treatment ceph tracing is done in: \nSelect and explain. \nA. Black, B. Blue, C. Red, D. Green', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]