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': 'Periodontal Screening and Recorder system (PSR) is\nrecorded by using periodontal probe which has ____________ \nSelect and explain. \nA. Graduation - 1, 2, 3, 4, 5, 6 7, B. 0.5mm ball tip with color coded 3.5 to 5.5mm, C. Color coded for every 3mm, D. Graduated - 1, 5, 10 & 15mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]