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
Joint involved in movement of head from left to right. 
Select and explain. 
A. Atlanto axial, B. Atlanto occipital, C. C2- C3 Joint, D. C3- C4 Joint
A: Atlanto axial
Answer: A: Atlanto axial 
Explanation: 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).