This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Right to left movement occurs at: 
Select and explain. 
A. Atlanto-axial, B. Atlanto-occipital, C. C2 -C3, D. C3 -C4
A: Atlanto-axial
Answer: A: Atlanto-axial 
Explanation: Ans. a. Atlanto-axialTo look right or left ('NO' movements of head) occurs at the Atlanto-axial Joint.'YES' movements occur at the Atlanto-occipital Joint and involve flexion and extension of head over vertebra.C2-C3 and C3-C4 joints allow mainly flexion and extension of the neck and small degree of rotation is also possible.