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': 'Gates Glidden drill is used to: \nSelect and explain. \nA. Remove the lingual shoulder, B. Enlarge the canal orifice, C. For the preparation of post space, D. Both 1 and 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The Gates-Glidden drill is used to:\n\nRemove the lingual shoulder during access preparation of the anterior teeth\nEnlarge root canal orifices.\n\nTextbook of Endodontics Nisha GARG 3rd ED', 'role': 'assistant'}]