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': 'Which of the following cephalometric point can be altered by orthodontic tooth movement? \nSelect and explain. \nA. Point-A, B. ANS, C. Nasion, D. Gonion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Subspinale ("A" Point)\nThe most posterior point on the curve between ANS and PR (SPr).\n"A" point is usually found 2 mm anterior to the apices of the maxillary central incisor root.', 'role': 'assistant'}]