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 instruments will have a four\nnumber formula \nSelect and explain. \nA. ordinary hatchet, B. GMT, C. Jeffery hatchet, D. all the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]