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: Unknown
[{'content': 'Median Atlanto-axial joint is which type of joint - \nSelect and explain. \nA. Pivot, B. Hinge, C. Saddle, D. Ellipsoid', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Plane o There are two types of atlanto-axial joints, both of which are synovial joints - i) One median atlanto-axial joint - Pivot joint. ii) Two lateral atlanto-axial joints - Plane synovial joint (flat joint).", 'role': 'assistant'}]