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': 'Root end preparation in teeth with short root is called as: \nSelect and explain. \nA. Matsura preparation., B. Trephination, C. Window preparation., D. Cone shaped preparation.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In teeth with short root, vertical preparation is done fir root end, which is through nad through from buccal to lingula side, this is known as matsura preparation.', 'role': 'assistant'}]