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': 'During orthodontic movement of maxillary central Incisor, centre of rotation is present at apex. It shows: \nSelect and explain. \nA. Controlled tipping, B. Uncontrolled tipping, C. Translation, D. Intrusion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Different Types of Orthodontic Tooth Movements\nTIPPING:-\nSimplest tooth movement.\nControlled tipping – Centre of rotation at its apex.\nUncontrolled tipping – Centre of rotation is very close or at centre of resistance.', 'role': 'assistant'}]