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: Anatomy
[{'content': 'Joint involved in movement of head from left to right. \nSelect and explain. \nA. Atlanto axial, B. Atlanto occipital, C. C2- C3 Joint, D. C3- C4 Joint', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer A. Atlanto axialAtlanto-occipital (between skull and C1) joint permit nodding of head ( as when indicating approval or YES) and Atlanto-axial joint permits the head to be turned from side to side (as indicating disapproval or NO).', 'role': 'assistant'}]