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
Root end preparation in teeth with short root is called as: 
Select and explain. 
A. Matsura preparation., B. Trephination, C. Window preparation., D. Cone shaped preparation.
A: Matsura preparation.
Answer: A: Matsura preparation. 
Explanation: 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.