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: ENT
[{'content': 'Incudomalleolar joint is a; \nSelect and explain. \nA. Saddle joint, B. Pivot joint, C. Gliding joint, D. Hinge joint', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The incudomalleolar joint is a saddle joint while the incudostapedial is a ball and socket joint. Both of them are synol joints covered by capsular ligament.', 'role': 'assistant'}]