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 K files is \nSelect and explain. \nA. Made of stainless steel rectangular block, B. Have high fracture resistance, C. Have low cutting efficiency, D. Has less no of flutes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]