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': 'Which color is given to the “progress of treatment" cephalometric tracing, according to American Board of Orthodontics? \nSelect and explain. \nA. Black, B. Blue, C. Red, D. Green', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In order to facilitate identification of consecutive cephalogram, the following colour code for tracing has been suggested by American Board of Orthodontics.', 'role': 'assistant'}]