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': 'False about GG drill is \nSelect and explain. \nA. NO. 4 is 1.1 mm in size, B. Operated at 750-1500 rpm, C. Used for coronal flaring of root canal, D. Used for preparing post space', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]