This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology of Head and Neck, Subject name: Anatomy
[{'content': 'The movement at the following joint permits a person to say NO by head movement: \nSelect and explain. \nA. Atlanto-occipital joint, B. Atlanto-axial joint, C. C2-C3 joint, D. C3-C4 joint', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Atlanto-axial jointRef: Gray's 38th ed/521* Atlanto-occipital (between skull and Cl) joint permit nodding of head (as when indicating approval or yes) and,* Atlantoaxial joint permits the head to be turned from side to side i.e. rotation (as indicating disapproval, the NO movement).", 'role': 'assistant'}]