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': 'Overjet and overbite of malocclusion is assessed using WHO survey from 1997 with the help of the instrument: \nSelect and explain. \nA. Williams probe, B. CPI probe, C. Measuring scale, D. Straight probe', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]