This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'For side to side movement at neck which of the following joint involved (2019) \nSelect and explain. \nA. Atlanto - axial joint, B. Atlanto -occipital joint, C. Occipital -axial joint, D. C6 - C7 aiculation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]