This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Atlanto-Occipital Joint is 
Select and explain. 
A. Ellipsoidal joint, B. Pivot joint, C. Saddle joint, D. Condyloid joint
A: Ellipsoidal joint
Answer: A: Ellipsoidal joint 
Explanation: Atlanto-occipital Joints Type: These are synol joints of the ellipsoid variety.Aicular Surfaces Above: The occipital condyles, which are convex Below: The superior aicular facets of the atlas veebra. These are concave. The aicular surfaces are elongated, and are directed forwards and medialReference: Chaurasia; 6th edition; Page no: 204