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 of the following is not a marking in Michigam O probe \nSelect and explain. \nA. 3, B. 6, C. 8, D. 9', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mischigam O probe is a manual probe having marking 3,6,8.', 'role': 'assistant'}]