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: Orthopaedics
[{'content': 'Left-Right movement of skull occurs at \nSelect and explain. \nA. C2 - C3, B. Atlanto - occipital joint, C. Atlanto - axial joint, D. C4 - C5', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Left-Right movement of skull occurs at Atlanto - axial joint.\nUp - down movement of skull occurs at Atlanto - occipital joint.', 'role': 'assistant'}]