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': 'Torquing movement in orthodontics \nSelect and explain. \nA. Is movement of the root without moving the crown, B. Cannot be accomplished in clinical practice, C. Is always deleterious to the tooth, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]